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Assignment on HYDROCARBON with answers., Assignments of Organic Chemistry

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1106 Hydrocarbon
Alkane
1. Which represents an alkane [CPMT 1976]
(a)
85 HC
(b)
68 HC
(c)
109HC
(d)
167HC
2. The decreasing order of boiling points is[BHU 1999]
(a) n-Pentane > iso-Pentane > neo-Pentane
(b) iso-Pentane > n-Pentane > neo-Pentane
(c) neo-Pentane > iso-Pentane > n-Pentane
(d) n-Pentane > neo-Pentane > iso-Pentane
3. To prepare a pure sample of n-hexane using
sodium metal as one reactant, the other reactant
will be [BHU 1999]
(a) n-propyl bromide
(b) Ethyl bromide and n-butyl bromide
(c) Ethyl chloride and n-butyl chloride
(d) Methyl bromide and n -pentyl chloride
4. In the preparation of Grignard reagent from
haloalkane, the metal [RPET 1999]
(a) Mg (b) Zn
(c) Li (d) K
5. Sodium acetate can be converted to ethane by
[Pune CET 1998]
(a) Heating with
4
LiAlH
(b) Electrolysing its aqueous solution
(c) Heating with sodalime
(d) Heating with calcium acetate
6. Which of the following compounds is used in
antiknock compositions to prevent the deposition
of oxides of lead on spark plug, combustion
chamber and exhaust pipe
[KCET 1998]
(a) Glycerol (b) Glycol
(c) 1, 2-dibromoethane (d) Benzene
7. Which of petroleum corresponds to kerosene oil
[DCE 1999]
(a)
1815 CC
(b)
1210 CC
(c)
(d)
91 CC
8. In the reaction
33 2CHBrNaBrCH
, the
product called
[Pb. CET 1999; CPMT 1983. 86; KCET 1992;
MP PMT 1994; BHU 1998; MP PMT 2002; MP PET 1986]
(a) Wurtz reaction (b) Aldol condensation
(c) Perkin’s reaction (d) Levit reaction
9. Iodoethane reacts with sodium in the presence of
dry ether. The product is [AFMC 1997; KCET 1998 ]
(a) Pentane (b) Propane
(c) Butene (d) Butane
10. Which of the following is oxidised by
4
KMnO
(a) Methane (b) Pentane
(c) Isobutane (d) Neopentane
11. Which of the following has maximum stability[AIIMS 2001]
(a)
3
HC
(b)
H
H
CCH
|
3
(c)
3
|
3CH
H
CCH
(d)
3
3
|
3CH
CH
CCH
12. The most volatile compound is [DPMT 2000]
(a) 2, 2-dimethyl propane (b) 2-methyl butane
(c) Isobutane (d) n-pentane
13. In Wurtz reaction, the reagent used is[EAMCET 1998]
(a) Na (b)
3
liquid NHNa
(c)
ether dryNa
(d)
alcohol dryNa
14. Which of the following has highest octane number
[MP PMT 2000]
(a) n-hexane (b) n-heptane
(c) n-pentane (d) 2, 2, 4-trimethyl
pentane
15. What is freon-12 [RPET 1999]
(a) Pesticide (b) Refrigerant
(c) Solvent (d) Lubricant
16. The petrol having octane number 80 has[MP PET 2000]
(a) 20% normal heptane + 80% iso-octane
(b) 80% normal heptane + 20% iso-octane
(c) 20% normal heptane + 80% normal octane
(d) 80% normal heptane + 20% normal octane
17. Which of the following reactions will not give
propane
[DPMT 2005]
(a)
OH
Mg
ClCHCHCH 2
ether/
223
(b)
OH
MgXCH
COClCH 2
3
3
(c)
COOHCH
HB
CHCHCH 3
62
23
(d)
HIP
OH
CHCHCH /
|33
18. The shape of methane molecule is[MP PET 1997, 2001]
(a) Linear (b) Trigonal planar
(c) Square planar (d) Tetrahedral
19. Which of the following shows only one
brominated compound [CPMT 1996]
(a) Butene-2 (b) 2, 2-dimethylpropane
(c) Butyne-1 (d) Butanol-3
20. Kerosene is used as fuel because it is [CPMT 1996]
(a) Less volatile (b) More volatile
(c) Cheap (d) Abundantly available
21.
Product
3
3223 HBr
AlCl
CHCHCHCH
. Product in
above reaction is [RPMT 2003]
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22
pf23
pf24
pf25
pf26
pf27
pf28
pf29
pf2a
pf2b
pf2c
pf2d
pf2e
pf2f
pf30
pf31
pf32
pf33
pf34
pf35
pf36
pf37

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Alkane

1. Which represents an alkane [CPMT 1976]

(a)

5 8

CH (b)

8 6

CH

(c)

9 10

CH (d)

7 16

CH

2. The decreasing order of boiling points is [BHU 1999]

(a) n - Pentane > iso-Pentane > neo-Pentane

(b) iso-Pentane > n - Pentane > neo-Pentane

(c) neo-Pentane > iso-Pentane > n - Pentane

(d) n - Pentane > n eo-Pentane > iso-Pentane

3. To prepare a pure sample of n-hexane using

sodium metal as one reactant, the other reactant

will be [BHU 1999]

(a) n - propyl bromide

(b) Ethyl bromide and n - butyl bromide

(c) Ethyl chloride and n - butyl chloride

(d) Methyl bromide and n - pentyl chloride

4. In the preparation of Grignard reagent from

haloalkane, the metal [RPET 1999]

(a) Mg (b) Zn

(c) Li (d) K

5. Sodium acetate can be converted to ethane by

[Pune CET 1998]

(a) Heating with

4

LiAlH

(b) Electrolysing its aqueous solution

(c) Heating with sodalime

(d) Heating with calcium acetate

6. Which of the following compounds is used in

antiknock compositions to prevent the deposition

of oxides of lead on spark plug, combustion

chamber and exhaust pipe

[KCET 1998]

(a) Glycerol (b) Glycol

(c) 1, 2-dibromoethane (d) Benzene

7. Which of petroleum corresponds to kerosene oil

[DCE 1999]

(a)

15 18

CC (b)

10 12

C  C

(c)

5 9

CC (d)

1 9

C  C

8. In the reaction      3 3

CH Br 2 Na Br CH , the

product called

[Pb. CET 1999; CPMT 1983. 86; KCET 1992;

MP PMT 1994; BHU 1998; MP PMT 2002; MP PET 1986]

(a) Wurtz reaction (b) Aldol condensation

(c) Perkin’s reaction (d) Levit reaction

9. Iodoethane reacts with sodium in the presence of

dry ether. The product is [AFMC 1997; KCET 1998]

(a) Pentane (b) Propane

(c) Butene (d) Butane

10. Which of the following is oxidised by

4

KMnO

(a) Methane (b) Pentane

(c) Isobutane (d) Neopentane

11. Which of the following has maximum stability [AIIMS 2001]

(a)

3

CH

(b) H

H

CH  C 

|

3

(c)

3

|

3

CH

H

CH  C 

(d)

3

3

|

3

CH

CH

CHC

12. The most volatile compound is [DPMT 2000]

(a) 2, 2-dimethyl propane (b) 2 - methyl butane

(c) Isobutane (d) n - pentane

13. In Wurtz reaction, the reagent used is [EAMCET 1998]

(a) Na (b)

3

Na liquid NH

(c) Na dryether

(d) Na dryalcohol

14. Which of the following has highest octane number

[MP PMT 2000]

(a) n - hexane (b) n - heptane

(c) n - pentane (d) 2, 2, 4 - trimethyl

pentane

15. What is freon- 12 [RPET 1999]

(a) Pesticide (b) Refrigerant

(c) Solvent (d) Lubricant

16. The petrol having octane number 80 has [MP PET 2000]

(a) 20% normal heptane + 80% iso-octane

(b) 80% normal heptane + 20% iso-octane

(c) 20% normal heptane + 80% normal octane

(d) 80% normal heptane + 20% normal octane

17. Which of the following reactions will not give

propane

[DPMT 2005]

(a)

HO

Mg

CH CHCH Cl

2

/ ether

3 2 2

(b)

HO

CHMgX

CH COCl

2

3

3

 

(c)

CHCOOH

BH

CH CH CH

3

26

3 2

  

(d)   

PHI

OH

CH CH CH

/

|

3 3

18. The shape of methane molecule is [MP PET 1997, 2001]

(a) Linear (b) Trigonal planar

(c) Square planar (d) Tetrahedral

19. Which of the following shows only one

brominated compound [CPMT 1996]

(a) Butene- 2 (b) 2, 2-dimethylpropane

(c) Butyne- 1 (d) Butanol- 3

20. Kerosene is used as fuel because it is [CPMT 1996]

(a) Less volatile (b) More volatile

(c) Cheap (d) Abundantly available

21. Product

3

3 2 2 3

HBr

AlCl

CHCHCHCH  . Product in

above reaction is [RPMT 2003]

(a)

2 3

|

3

CH CH

Br

CH  CH  

(b)

3

3

|

3

CH

CH

CH  CH 

(c)

3

|

2 2

|

2

CH

CH CH

Br

CH  

(d) All of these

22. Which of the following statements is not true for

ethane

[AIIMS 1996]

(a) It can be chlorinated with chlorine

(b) It can be catalytically hydrogenated

(c) When oxidised produces

2

CO and H O

2

(d) It is a homologue of iso-butane

23. Petroleum refining is [AIIMS 1996; KCET 2004]

(a) Distillation of petroleum to get different

fractions

(b) Obtaining aromatic compounds from aliphatic

compounds present in petroleum

(c) Cracking of petroleum to get gaseous

hydrocarbons

(d) Purification of petroleum

24. The chemical added to leaded petrol to prevent

the deposition of lead in the combustion chamber

is

[Kerala (Med.) 2003]

(a) Iso-octane (b) Ethylene dibromide

(c) Tetraethyl lead (d) Mercaptan

(e) n - Heptane

25. In the commercial gasolines, the type of

hydrocarbons which are more desirable is [CBSE PMT 1997; AFMC 1997]

(a) Branched hydrocarbon

(b) Straight-chain hydrocarbon

(c) Linear unsaturated hydrocarbon

(d) Toluene

26. Which of the following is not formed by the

reaction of

2

Cl

on

4

CH

in sunlight [AIIMS 1987]

(a)

3

CHCl (b) CH Cl

3

(c)

3 3

CHCH (d)

3 2 3

CHCHCH

27. Which of the following has the highest boiling

point

[DPMT 1986]

(a) Neopentane (b) n - butane

(c) n - heptane (d) Isobutane

28. Which gives

4

CH when treated with water

[CPMT 1974, 79; NCERT 1976; IIT-JEE 1990]

(a) Silicon carbide (b) Calcium carbide

(c) Aluminium carbide (d) Iron carbide

29. Which of the following does not react with 5

PCl

[CPMT 1973]

(a) CH OH

3

(b) CH COOH

3

(c) CH CHO

3

(d)

2 6

CH

30. Which of the following compounds is insoluble

even in hot concentrated

2 4

HSO [IIT-JEE 1983]

(a) Ethylene (b) Benzene

(c) Hexane (d) Aniline

31. A reaction between methyl magnesium bromide

and ethyl alcohol gives [CPMT 1979; MNR 1986; UPSEAT 1999]

(a) Methane (b) Ethane

(c) Propane (d) Butane

32. Methane and ethane both can be obtained in

single step from

[CPMT 1974; MP PET 1995; AFMC 1998, 2000; BHU 2005]

(a) CH I

3

(b) C HI

2 5

(c) CH OH

3

(d) C HOH

2 5

33. Paraffin wax is [MP PMT 1986; CPMT 1993]

(a) Ester

(b) Alcohol

(c) Unsaturated hydrocarbon

(d) Saturated hydrocarbon

34. The number of possible enantiomeric pairs that

can be produced during monochlorination of 2-

methylbutane is

[IIT-JEE 1997]

(a) 2 (b) 3

(c) 4 (d) 1

35. Petroleum consists mainly of [CPMT 1985, 94; KCET 1991]

(a) Aliphatic hydrocarbons (b)Aromatic hydrocarbons

(c) Aliphatic alcohols (d) None of these

36. Petroleum ether can be used as

(a) Solvent for fat, oil, varnish and rubber

(b) As a fuel

(c) Both (a) and (b)

(d) None of these

37. Which of the following are produced from coaltar

[MNR 1987; UPSEAT 2002]

(a) Synthetic dyes (b) Drugs

(c) Perfumes (d) All the three

38. In alkanes, the bond angle is [MP PMT 1989; BHU 1996]

(a)

o

  1. 5 (b)

o

109

(c)

o

120 (d)

o

180

39. In the preparation of alkanes; a concentrated

aqueous solution of sodium or potassium salts of

saturated carboxylic acid are subjected to [CPMT 1985; MP PET 1999]

(a) Hydrolysis (b) Oxidation

(c) Hydrogenation (d) Electrolysis

40. Halogenation of alkanes is an example of

[MP PET 1993; KCET 1998]

(a) Electrophilic substitution

(b) Nucleophilic substitution

(c) Free-radical substitution

(d) Oxidation

41. Propionic acid is subjected to reduction with

hydroiodic acid in the presence of a little P , the

product formed is

(d) n - butane

64. Aqueous solution of the following compound on

electrolysis gives ethane

[NCERT 1983; MP PET 1985; CPMT 1975, 79]

(a) Acetic acid (b) Acetamide

(c) Potassium acetate (d) Ethyl acetate

65. Which of the following does not decolourise

bromine solution in carbon disulphide [MP PET 1986]

(a) Acetylene (b) Propene

(c) Ethane (d) Propyne

66. Anhydrous sodium acetate on heating with

sodalime gives

[CPMT 1972, 84; Pb. CET 2001, 2003]

(a) Acetic acid (b) Methane

(c) Calcium acetate (d) Ethane

67. Water gas is [CPMT 1993, 2004; Pb. PMT 2004]

(a)

2

COCO (b)

2

CO  N

(c)

2

COH (d)

2 2

CO  N  H

68. A sample of gasoline contains 81% iso- octane and

19% n - heptane. Its octane number will be [MP PMT 1995]

(a) 19 (b) 81

(c) 100 (d) 62

69. The natural petroleum contains [MP PMT 1995]

(a) Saturated hydrocarbons

(b) Cyclic saturated hydrocarbons

(c) Compounds of sulphur

(d) All of these

70. The preparation of ethane by electrolysis of

aqueous solution of potassium acetate is called as [MP PMT 1995]

(a) Wurtz reaction

(b) Sabatier-Senderen's reaction

(c) Kolbe's synthesis

(d) Grignard reaction

71. Action of hydrogen chloride on

3

|

3 2

CH

CHCCH

and on CHCH will predominantly give the

compounds, respectively

(a)

3

|

3 2

CH

CHCHCHCl and CH Cl CHCl

2 2

(b)

3

|

3 3

CH

CHCClCH and

3 2

CHCHCl

(c)

3

|

3 2

CH

CHCHCHCl and

3 2

CHCHCl

(d)

3

|

3 3

CH

CHCHCH and CH Cl CHCl

2 2

72. As the number of carbon atoms in a chain

increases the boiling point of alkanes [AFMC 1989]

(a) Increases

(b) Decreases

(c) Remains same

(d) May increase or decrease

73. In the fractional distillation of crude petroleum

[Roorkee 1989]

(a) Petrol condenses at the bottom of the column

(b) The gases condense at the top of the column

(c) High boiling constituents condense at the

bottom of the column

(d) High boiling constituents condense at the top

of the column

74. Which of the following is not an endothermic

reaction

[J & K 2005]

(a) Dehydrogenation

(b) Ethane to ethene

(c) Combustion of propane

(d) Change of chlorine molecule into chlorine

atoms.

75. Gasoline is the name of [Roorkee 1989]

(a) Crude oil

(b) The gaseous constituents of petroleum

(c) The mixture of uncondensed gases produced

in the distillation of crude oil

(d) The mixture of the residue and gas oil

obtained in the distillation of crude oil

76. In the process of cracking [Roorkee 1989]

(a) Organic compounds decompose into their

constituent elements

(b) Hydrocarbons decompose into carbon and

hydrogen

(c) High molecular weight organic compounds

decompose to give low molecular weight

organic compounds

(d) Hydrocarbons yield alkyl radicals and

hydrogen

77. Octane number has 0 value for

[Roorkee 1989; MP PET 1999, 2002;

MP PMT 2001; KCET 2002]

(a) iso-octane (b) n - hexane

(c) n - heptane (d) iso-heptane

78. Dry distillation of sodium propanoate with

sodalime gives

[CPMT 1996]

(a) Propane (b) Propene

(c) Ethane (d) Ethene

79. What is the chief product obtained when n- butane

is treated with bromine in the presence of light at

C

o

130

[IIT-JEE 1995]

(a)

3

|

3 2

CH

CHCHCHBr

(b)

3

|

3 2

CH

CHCHCHBr

(c)

3

|

3

|

3

CH

CH

CHCBr

(d) CHCHCHCHBr

3 2 2 2

80. A mixture of propene and methane is obtained by

the cracking of

(a) 1 - butene (b) 2 - butene

(c) n - butane (d) Isobutane

81. Which of the following fractions of petroleum

refining contains kerosene? (Boiling ranges in

C

o

are given below)

(a) 40 - 80 (b) 80 - 200

(c) 200 - 300 (d) Above 300

82. Which of the following statements is incorrect?

The members of the homologous series of alkanes

[NCERT 1974]

(a) Are all straight chain compounds

(b) Have the general formula

n 2 n  2

CH

(c) Have similar chemical properties

(d) Show a regular gradation of physical

properties

83. On mixing tetraethyl lead to gasoline available at

petrol pumps [CPMT 1981]

(a) Calorific value of the fuel increases

(b) Odour diminishes

(c) Less smoke is obtained on combustion

(d) Antiknock property of fuel increases

84. A liquid hydrocarbon can be converted to gaseous

hydrocarbon by [CPMT 1980; MP PMT 2001]

(a) Cracking

(b) Hydrolysis

(c) Oxidation

(d) Distillation under reduced pressure

85. The tetrahedral nature of carbon was first given

by

[MP PMT 1994]

(a) Kekule (b) Le Bell and Van't

Hoff

(c) Pauling (d) Armstrong and Bayer

86. Formation of alkane by the action of Zn on alkyl

halide is called [DPMT 1984; MHCET 2004]

(a) Frankland's reaction (b) Wurtz reaction

(c) Cannizzaro reaction (d) Kolbe's reaction

87. Which of the following compounds will form a

hydrocarbon on reaction with Grignard reagent [CPMT 1988, 93]

(a) CH CH OH

3 2

(b) CH CHO

3

(c)

3 3

CHCOCH (d)

3 2 2

CHCOCH

88. Name the hydrocarbon that is a liquid at STP

(a) Ethane (b) Propane

(c) n-butane (d) n - pentane

89. Which statement is not true concerning alkanes

[MP PET 2003]

(a) Large number alkanes are soluble in water

(b) All alkanes have a lower density than water

(c) At room temperature some alkanes are

liquids, some solids and some gases

(d) All alkanes burn

90. Fischer Tropsch process is used for the

manufacture of

[DCE 1999; MP PET 2003]

(a) Synthetic petrol (b) Thermosetting

plastics

(c) Ethanol (d) Benzene

91. Which one of the following compounds cannot be

prepared by Wurtz reaction [Kurukshetra CEE 2002;

MP PMT 2002; MP PET 2003]

(a)

4

CH (b)

2 6

CH

(c)

3 8

CH (d)

4 10

CH

92. A fuel contains 25 % n - heptane and 75 % iso-

octane. Its octane number is [MP PMT 1993; MP PET 1994]

(a) 50 (b) 75

(c) 100 (d) 25

93. Sodium ethoxide is a specific reagent for [CPMT 1985]

(a) Dehydration

(b) Dehydrogenation

(c) Dehydrohalogenation

(d) Dehalogenation

94. Which of the following has highest percentage of

hydrogen

[CPMT 1975; 79]

(a)

4

CH (b)

2 4

CH

(c)

6 6

CH

(d)

2 2

CH

95. What is the molecular formula of the alkane, the

5.6 litre of which weight 11 g at STP [MP PMT 2003]

(a)

6 14

CH (b)

4 10

CH

(c)

3 8

CH (d)

2 6

CH

96. The reference compound `iso-octane' which is

used in determining the octane number of

gasoline has the structure

(a)

3 3 3 3 3

CH  CH ( CH ) CH ( CH ) CH ( CH ) CH

(b)

3 32 2 3 3

CH  C ( CH )  CH  CH ( CH ) CH

(c)

3 32 3 2 3

CH  C ( CH )  CH ( CH ) CH  CH

(d)

3 32 32 3

CH  C ( CH )  C ( CH )  CH

97. Sample of 2, 3 - dibromo- 3 - methylpentane is

heated with zinc dust. The resulting product is

isolated and heated with HI in the presence of

phosphorus. Indicate which is the structure that

represent the final organic product formed in the

reaction [CBSE PMT 1991]

(a)

3

|

3 2 2 3

CH

CHCHCHCHCH

(c)

2 4

COHCH (d)

4 2 6 3 8

CH  CH  CH

116. By Wurtz reaction, a mixture of methyliodide and

ethyliodide gives [BHU 2003]

(a) Butane

(b) Ethane

(c) Propane

(d) A mixture of the above three

117. Product obtained by nitration of propane is [RPMT 2003]

(a) Nitropropane (b) Nitromethane

(c) Nitroethane (d) All of these

118. Isomerism in saturated hydrocarbons is due to

(a) Change in the valence of carbon

(b) Change in the ratio of elements in compounds

(c) Formation of branches in the chain of C atoms

(d) Formation of double bond

119. Photochemical chlorination of alkane is initiated

by a process of [DPMT 1985; NCERT 1978]

(a) Pyrolysis (b) Substitution

(c) Homolysis (d) Peroxidation

120. Which of the following is not linked with methane

(a) Marsh gas (b) Natural gas

(c) Producer gas (d) Coal gas

121. Which of the following has highest octane number

[MP PET 1996]

(a) n- hexane

(b) n- heptane

(c) Iso- octane

(d) n- heptane and iso-octane mixed in ratio 50 :

122. A mixture of ethyl iodide and n - propyl iodide is

subjected to Wurtz reaction. The hydrocarbon

that will not be formed is

[IIT-JEE (Screening) 1990]

(a) n - butane (b) n - propane

(c) n - pentane (d) n - hexane

123. Most of the hydrocarbons from petroleum are

obtained by

[CPMT 1974, 80]

(a) Fractional distillation (b)Fractional crystallization

(c) Vaporization (d) Polymerization

124. Which is the best antiknock compound or Which

one of the following substances is used as an

antiknock compound

[CPMT 1974, 81, 99, 2000;RPMT 2002; CBSE PMT 1996;

KCET (Med.) 2000 MP PET 1985, 87, 97, 2001;

MP PMT 1994, 96; AIIMS 2000 ]

(a) Lead tetrachloride (b) Lead acetate

(c) Zinc ethyl (d) Tetraethyl lead (TEL)

125. In the dichlorination reaction of propane, mixture

of products are obtained. How many isomers, the

mixture contains [Orissa JEE 2003]

(a) 2 (b) 3

(c) 4 (d) 5

126. Which of the following cycloalkane gives open

chain compound, when reacts with bromine [Orissa JEE 2003]

(a) Cyclopropane (b) Cyclopentane

(c) Cyclohexane (d) Cyclo-octane

127. Grignard reagent is not prepared in aqueous

medium but prepared; in ether medium because

the reagent

[KCET 2002]

(a) Reacts with water

(b) Is insoluble in water

(c) Is highly reactive in ether

(d) Becomes inactive in water

128. A sample of petrol is a mixture of 30% n - heptane

and 70% iso - octane. The sample has octane

number

[MP PET 1985]

(a) 30 (b) 70

(c) 15 (d) 35

129. For the reduction of ketones to hydrocarbon, the

appropriate agent is [DPMT 2002]

(a) HI (b) ZnHg / HCl

(c) Red phosphorous (d)

2 4

HSO

130. Heating of alkanes with fuming sulphuric acid or

oleum at high temperature, which forms

sulphonic acid, is called

[MH CET 1999]

(a) Nitration (b) Halogenation

(c) Sulphonation (d) Oxidation

131. Propane is obtained from propene by which

method?

[CPMT 1997; CBSE PMT 2001;

AFMC 2001; MH CET 2001]

(a) Catalyst hydrogenation (b) Wurtz reaction

(c) Dehydrogenation (d) Frankland reaction

132. B.P. of branched chain alkanes as compared to

straight chain alkanes are [MP PMT 1987; AIIMS 1999]

(a) Lower

(b) Equal

(c) Higher

(d) Independent of the chain

133. Daily use candles (paraffin wax) contain [CPMT 1996]

(a) Higher saturated hydrocarbon

(b) Lower saturated hydrocarbon

(c) Higher unsaturated hydrocarbon

(d) Lower unsaturated hydrocarbon

134. The reaction

CHCl   CHClHCl

3

uvlight

4 2

is an

example of [CBSE PMT 1999, 2002]

(a) Addition reactions (b) Substitution reaction

(c) Elimination reaction (d) Rearrangement

reaction

135. Normal butane convert into isobutane by [RPMT 2002]

(a)

4

LiAlH

(b)

3

AlCl

(c)

4

NaBH (d) Zn / HCl

136. Alcoholic solution of KOH is used for

[CPMT 1982, 86; IIT-JEE 1990]

(a) Dehydration (b) Dehydrogenation

(c) Dehydrohalogenation(d) Dehalogenation

137. Aluminium carbide on reacting with water gives

[NCERT 1981; MP PET 1985]

(a) Methane (b) Ethane

(c) Ethene (d) Ethyne

138. Maximum carbon-carbon bond distance is found

in

[MP PMT 1987; IIT-JEE 1981; Bihar MEE 1995]

(a) Ethyne (b) Ethene

(c) Ethane (d) Benzene

139. Which of the following reaction is expected to

readily give a hydrocarbon product in good yields [CBSE PMT 1997]

(a)   

OxidationElectrolysis

RCOOK

(b) 

2

I

RCOOAg

(c)

hv

Cl

CH  CH  

2

3 3

(d)   

CHOH

CH CCl

25

3 2

( )

140. Out of the following fractions of petroleum, the

one having the lowest boiling point is or Which of

the following is obtained at lowest temperature

by fractional distillation of petroleum [MP PMT 1993; MP PET 1996]

(a) Kerosene (b) Diesel oil

(c) Gasoline (d) Heavy oil

141. The marsh gas detector used by miners works on

the principle of [AMU 1984]

(a) Difference in the rates of diffusion of gases

(b) Avogadro's hypothesis

(c) Gay-Lussac's law of gaseous volumes

(d) Berzelius hypothesis

142. Methane can be prepared by [DCE 2001]

(a) Wurtz's reaction (b) Decarboxylation

(c) Hydrogenation reaction (d) All of these

143. The most strained cycloalkane is [IIT-JEE 1981]

(a) Cyclopropane (b) Cyclobutane

(c) Cyclopentane (d) Cyclohexane

144. Which does not react with chlorine in dark [Pb. PMT 2000]

(a)

2 4

CH (b)

2 2

CH

(c)

4

CH (d) CH CHO

3

145. Main constituent of marsh gas is

[IIT-JEE 1980; MP PMT 1994; AFMC 1997]

(a)

2 2

CH (b)

4

CH

(c) HS

2

(d) CO

146. Which of the following method can be used for the

preparation of methane

(a) Wurtz reaction (b) Kolbe's reaction

(c) Reduction of alkyl halide (d)Hydrogenation of alkene

147. Which hydrocarbon will be most stable

[MP PET 2000, 03]

(a) Methane (b) Ethane

(c) Propane (d) Butane

148. C-H bond length is greatest in

[IIT-JEE 1989; MNR 1990; AMU 2002]

(a)

2 2

CH (b)

2 4

CH

(c)

2 6

CH (d)

2 2 2

CHBr

149. Which one of the following compounds does not

form an ozonide [EAMCET 1997]

(a) Ethene (b) Propyne

(c) Propene (d) Propane

150. Which type of hybridisation occurs in ethylene

[CBSE PMT 1991; Bihar MEE 1996; JIPMER 1997]

(a) sp (b)

2

sp

(c)

3

sp (d) sp d

3

151. Silver acetylide when heated with HCl gives

(a)

2 2

CH (b)

2

H

(c)

2 4

CH (d) None of these

152. When sodium reacts with ethyl iodide, which of

the following hydrocarbons is produced

[NCERT 1984; BHU 1982]

(a) Methane (b) Ethane

(c) Butane (d) Ethene

153. Solid methane is [DPMT 1983; CBSE PMT 1989]

(a) Molecular solid (b) Ionic solid

(c) Covalent solid (d) Not possible

154. The shape of ethane is [Bihar CEE 1995]

(a) Triangular (b) Tetrahedral

(c) Linear (d) None of these

CH MgI

3

will give methane with [Roorkee 1995]

(a) C HOH

2 5

(b)

3 2 2

CH  CH  NH

(c)

3 3

CHCOCH (d) All of these

156. Propane- 1 - ol can be prepared from propene by its

reaction with [MP PMT 2003]

(a) CH COOH

3

(b)

3 3

H BO

(c)

2 6 2 2

BH / NaOH , HO (d) H SO HO

2 4 2

157. The process in which higher hydrocarbons are

broken down into lower hydrocarbons by

controlled pyrolysis, is called

[MP PMT 2002]

(a) Hydrolysis (b) Cracking

(c) Oxidation (d) Reduction

158. Successive alkanes differ by [MP PMT 2002]

(a)

2

CH (b) CH

(c)

3

CH (d)

2 4

CH

159. General formula of alkane is

[EAMCET 1979; Manipal MEE 1995]

(a)

n 2 n  2

CH

(b)

n 2 n  1

CH

(c)

n n

C H

2

(d)

n 2 n  1

CH

(d)

2 2

CH  CH

and heat

5. Alkenes usually show which type of reaction

[AIIMS 1999; MADT Bihar 1980]

(a) Addition (b) Substitution

(c) Elimination (d) Superposition

6. The propene reacts with HBr to form

[AIIMS 1999; RPET 1999]

(a) Ethane (b) Hexane

(c) 1 - bromo-propane (d) 2 - bromo propane

7. Ethylene may be obtained by dehydration of

which of the following with concentrated

2 4

HSO

at C

o

[RPET 1999]

(a) C HOH

2 5

(b) CH OH

3

(c) CH CH CHOH

3 2 2

(d) CH CHCH OH

3 2 2

3 3

3 3

HC CH

C C

HC CH

KOH (heat)

X

3 3

3 3

CH CH

C O O C

CH CH

X

in the above reaction is [CPMT 1985, 93]

(a)

3

HNO (b)

2

O

(c)

3

O (d)

4

KMnO

9. The disappearance of the characteristic purple

colour of

4

KMnO in its reaction with an alkene is

the test for unsaturation. It is known as

[CPMT 1989, 94; CBSE PMT 1990]

(a) Markownikoff's test (b) Baeyer's test

(c) Wurtz's test (d) Grignard test

10. A gas formed by the action of alcoholic KOH on

ethyl iodide, decolourises alkaline

4

KMnO. The gas

is

[KCET 2003]

(a)

2 6

CH (b)

4

CH

(c)

2 2

CH (d)

2 4

CH

CH CH Cl A

alc KOH

   

.

3 2

, the product is

[CPMT 2003]

(a) CH CHOK

3 2

(b) CH CHO

3

(c)

3 2 2 3

CHCHOCHCH (d)

2 2

CH  CH

12. The final product formed when ethyl bromide is

treated with excess of alcoholic KOH is [MP PET 1999]

(a) Ethylene (b) Ethane

(c) Ethyne (d) Vinyl bromide

13. Which of the following hydrocarbons cannot be

obtained by Sabatier and Senderen's reaction

(a)

4

CH (b)

2 6

CH

(c)

3 8

CH (d) All

14. When 3, 3 - dimethyl- 2 - butanol is heated with

2 4

HSO the major product obtained is [CBSE PMT 1995]

(a) cis and trans isomers of 2, 3 - dimethyl- 2 -

butene

(b) 3, 3-dimethyl- 1 - butene

(c) 2, 3-dimethyl- 2 - butene

(d) 2, 3-dimethyl- 1 - butene

15. The intermediate during the addition of HCl to

propene in the presence of peroxide is [IIT-JEE 1997]

(a) CH CHCH Cl

3 2

(b)

3 3

CHCHCH

(c)

3 2 2

CHCH CH (d)

3 2 2

CHCH CH

16. CH CH X

KOHHO

KMnO

2

4

/

2 2

  . Product ‘ X ’ in above

reaction is

[RPMT 2003]

(a) Ethylene glycol (b) Glucose

(c) Ethanol (d) All of these

17. Which of the following compounds represents

acrylonitrile

[JIPMER 1997]

(a) Vinyl cyanide (b) Cyanoethene

(c) Prop- 2 - ene nitrile (d) All of them

18. When acetylene reacts with arsenic trichloride in

the presence of anhydrous aluminium chloride, it

produces

[AFMC 1999]

(a) Lewisite

(b) -chlorovinyl dichloroarisine

(c) Nitrobenzene

(d) Both (a) and (b)

19. Ozonolysis of which one of the following will give

two molecules of acetaldehyde

[Bihar MEE 1997; MP PET 2000]

(a) 1 - butene (b) 2 - butene

(c) 1 - pentene (d) 2 - pentene

(e) None of these

20. In which of the following, addition of HBr does

not take place against Markownikoff's rule or

Anti-Markownikoff addition of HBr

is not

observed for

[IIT-JEE 1985; CBSE PMT 1994; MADT Bihar 1995;

MP PMT 1999; AMU 2002]

(a) Propene (b) But- 1 - ene

(c) But- 2 - ene (d) Pent- 2 - ene

21. Which one of the following characteristics apply

to both ethene and ethyne [NCERT 1990

(a) Explode when mixed with chlorine

(b) Decolourise Baeyer's reagent giving brown

precipitate

(c) Rapidly absorbed by cold conc.

2 4

HSO

(d) Form white precipitate with silver nitrate

solution

22. Which of the following has highest knocking

property

(a) Aromatic hydrocarbons

(b) Olefins

(c) Branched chain paraffins

(d) Straight chain paraffins

23. Dilute aqueous 4

KMnO , at room temperature

reacts with RCHCHR to give [Roorkee 1992]

(a) RCHO (b) RCOOH

(c) RCHOHCHOHR (d) CO HO

2 2

24. Aqueous sulphuric acid reacts with 2 - methyl- 1 -

butene to give predominantly [Roorkee 1992]

(a) Isobutyl hydrogen sulphate

(b) 2 - methyl- 2 - butanol

(c) 2 - methyl- 1 - butanol

(d) Secondary butyl hydrogen sulphate

25. How can ethene be produced from ethanol [BHU 1996]

(a) By dehydrohalogenation

(b) By dehydrogenation

(c) By dehydration with conc.

2 4

HSO at C

o

(d) By reduction with hydrogen iodide

26. Baeyer's reagent is used in the laboratory for

[CBSE PMT 1991, 92; AIIMS 1998; AFMC 1999]

(a) Detection of double bonds

(b) Detection of glucose

(c) Reduction

(d) Oxidation

27. Isopropyl alcohol is obtained by reacting which of

the following alkenes with conc.

2 4

HSO and H O

2

[MP PMT 1999]

(a) Ethylene (b) Propylene

(c) 2 - methyl propene (d) Isoprene

28. Which of the following compound is produced

when CH CH CH COOH

2 22

 ( ) reacts with HBr in

presence of peroxides [AIIMS 2000]

(a) CH CHCH COOH

3 25

(b) BrCH CH CH COOH

2 2 25

(c) CH CHCH CH COOH

3 2 2 25

(d) CH CHBrCHCHCOOH

3 2 2 2

29. One mole of each of the following alkenes is

catalytically hydrogenated. The quantity of heat

evolved will be the lowest in the case of [Roorkee 2000]

(a) 1 - butene (b) Trans- 2 - butene

(c) Cis- 2 - butene (d) 1, 3-butadiene

30. Which of the following is not used to distinguish

ethene from ethane

[KCET (Med.) 2001; UPSEAT 2002; CBSE PMT 2002]

(a) Iodine in

4

CCl (b) Bromine in

4

CCl

(c) Alkaline

4

KMnO (d) Ammonical

2 2

CuCl

31. A hydrocarbon X adds on one mole of hydrogen to

give another hydrocarbon and decolourised

bromine water. X reacts with

4

KMnO

in presence

of acid to give two moles of the same carboxylic

acid. The structure of X is

[JIPMER 2001]

(a)

2 2 2 3

CH  CH  CHCHCH

(b)

3 2 2 3

CH CHCH  CH  CHCH

(c)

3 2 2 3

CH CHCH  CHCH CH

(d)

3 2 2 3

CH CH  CHCHCHCH

32. When 2-bromobutane reacts with alcoholic KOH ,

the reaction is called [KCET (Med.) 2001]

(a) Halogenation (b) Hydrogenation

(c) Chlorination (d) Dehydro-

halogenation

33. 1, 3-butadiene reacts with ethylene to form [BHU 2001]

(a) Benzene (b) Cyclohexane

(c) Cyclohexene (d) 2, 3 dimethyl butane

34. Ethylene reacts with ozone gas to form the

compound [UPSEAT 2001]

(a) HCHO (b) C HOH

2 5

(c)

CH O

CH O

O

2

|

2

| (d) CH CHO

3

35. Oils are converted into fats by [Kerala (Med.) 2002]

(a) Hydration (b) Decarboxylation

(c) Hydrogentation (d) Dehydrogenation

(e) Hydrogenolysis

36. Which process converts olefins into parafins

[MP PET 2002]

(a) Halogenation (b) Dehydration

(c) Hydrogenation (d) Hydrolysis

37. Of the following the formula which represents a

saturated cyclic compound is [AMU 1983]

(a)

3 6

CH (b)

3 8

CH

(c)

8 10

CH (d)

8 12

CH

38. In a reaction, if half of the double bond is broken

and two new bonds are formed, this is a case of

[AMU 1983; NCERT 1978; CPMT 1983]

(a) Elimination (b) Addition

(c) Displacement (d) Rearrangement

39. Which of the following are formed on addition

reaction of DCI with 3-methyl- 1 - butene [Roorkee 2000]

(a)

2 32

CHDCHClCH ( CH ) (b)

2 2 32

CHDCHCCl ( CH )

(c)

3 32

CHCDClCH ( CH ) (d)

2 32

ClCHCHDCH ( CH )

40. Major product of the following reaction is

  CHCHalcoKOH

H

Br

CH C.

2 3

|

|

3

[MP PMT 1986]

(a) Butene- 1 (b) Butene- 2

(c) Butane (d) Butyne- 1

41. Cyclopentene on treatment with alkaline

4

KMnO

gives

[CPMT 1987]

(a) Cyclopentanol

(b) trans 1, 2-cyclopentanediol

(c) cis 1, 2-cyclopentanediol

(d) 1 : 1 mixture of cis and trans 1, 2 -

cyclopentanediol

42. Which of the following is the most stable alkene

62. The halogen which is most reactive in the

halogenation of alkenes under sunlight is [IIT-JEE 1981]

(a) Chlorine (b) Bromine

(c) Iodine (d) All equal

63. When ethene reacts with bromine, it forms

[AFMC 2000; KCET 2001]

(a) Chloroethane (b) Ethylene dibromide

(c) 1 bromopropane (d) 1,2-dichloroethene

64. Paraffins are soluble in [NCERT 1978]

(a) Distilled water (b) Benzene

(c) Methanol (d) Sea water

65. Addition of HCl to propene in presence of

peroxides gives

[BHU 1981, 98]

(a) 1 - Chloropropane (b) 2 - Chloropropane

(c) 3 - Chloropropane (d) Propene dichloride

66. The name of the product obtained by the addition

of HI to propene in presence of peroxide catalyst

is [KCET 2000]

(a) Isopropyl iodide (b) 2 - Iodopropene

(c) 2 - Iodopropane (d) 1 - Iodopropane

67. In the reaction C HCHCHHX  2 5 2

Product.

What is the product [BHU 2002]

(a)

2 5 3

C H  CH

(b) C HCH CHX

2 5 2 2

(c)

2 5 3

C H  CHX  CH

(d)

3 2 2

CH  CHX  CH  CH

68. Alkene can be prepared from alkyl halide by the

following reagent RXNu   NuH

Alkene [RPET 2000]

(a) Alc. KOH + heat (b) Aq. KOH + cold water

(c) NaOH (d) LiOH

69. 2 - chlorobutane is heated with alcoholic NaOH , the

product formed in larger amount is [RPET 1999; AMU 2000]

(a) 1 - Butene (b) 1 - Butyne

(c) 2 - Butene (d) All of these

70. Ethylene has high b.p. and high vapour pressure

at C

o

100 and does not dissolve in water. Hence

ethylene is separated by this method [UPSEAT 1999]

(a) Simple distillation (b) Vacuum distillation

(c) Vapour distillation (d) Alkali treatment

71. Addition of bromine to 1, 3-butadiene gives [AMU 1999]

(a) 1, 4-addition product only

(b) 1, 2-addition product only

(c) Both 1, 2-and 1, 4 addition product

(d) None of these

72. In the presence of peroxide, hydrogen chloride

and hydrogen iodide do not give anti-

Markovnikoff’s addition to alkenes because [IIT-JEE Screening 2001]

(a) Both are highly ionic

(b) One is oxidising and the other is reducing

(c) One of the steps is endothermic in both the

cases

(d) All the steps are exothermic in both the cases

73. The compound most likely to decolourize a

solution of potassium permanganate is [NCERT 1978]

(a)

3 3

CHCH

(b)

(c)

3 2 3

CH CH  CHCH CH

(d)

3

|

3

|

3 3

CH

CH

CHCCH

74. Ethylene is converted to X on passing through a

mixture of an acidified aqueous solution of

palladium chloride and cupric chloride. Which of

the following reagents readily take part in

addition reaction with X [UPSEAT 2003]

(a)

2

Br

(b) HBr

(c) HCl (d) HCN

75. Addition of HCl does not obey antimarkownikoff’s

rule because

[UPSEAT 2003]

(a) It is a strong acid (b) It is a gas

(c) Its bond energy is high (d)Its bond energy is less

76. Correct statement about1, 3-dibutene [UPSEAT 2003]

(a) Conjugated double bonds are present

(b) Reacts with HBr

(c) Forms polymer

(d) All of these

77. At low temperatures, the slow addition of

molecular bromine to CHCHCHCCH

2 2

gives

[Roorkee Qualifying 1998]

(a) CHCHCHCBrCHBr

2 2

(b) BrCHCHBrCHCCH

2 2

(c)

2 2 2 3

CHCHCHCHCBr

(d) CHCBrCHCCH

3 2 2

5

PCl reacts with propanone, to give [Pb. PMT 2001]

(a) vic - dichloride (b) Propanal

(c) propane-chloride (d) gem-dichloride

79. The compounds that will give an isomer of 2; 2-

dimethyl propane on catalytic hydrogenation are [AMU 1999]

3

3

|

3

CH

CH

CH CH  C  (2)

3 3

CH CH  CHCH

2 3

|

3

CHCH CH

H

CH C  (4)

3

3

|

3

|

3

CH

CH

C

CH

CH C  

(a) 1 and 4 (b) 2 and 4

(c) 1 and 3 (d) 1 and 2

80. Alkene

2

RCHCH reacts readily with

2 6

BH

and the product on oxidation with alkaline

hydrogen peroxides produces [CBS

(a) RCHCHO

2

(b) RCHCHOH

2 2

(c)

O

R C CH

||

3

  (d)

OH OH

R CH CH

| |

3

81. Bayer’s reagent is used for detection of [RPMT 2002]

(a) Amines (b) Glucose

(c) Unsaturated bond (d) Alcohol

82. Which of the following is(are) example(s) of

nucleophilic addition reaction in case of acetylene

(a) Addition of water (b) Addition of HCN

(c) Addition of

3

AsCl

(d) All

83. Structural formula for lewisite is

(a)

3

CHAsCl

CHCl

(b)

3

2

CHAsCl

CHCl

(c)

2

CHAsCl

CHCl

(d) None of these

84. Propene when heated with chlorine at about

C

o

500 forms

[MP PET 1997]

(a)

2 2

CH Cl. CHCH (b) CH CHClCHCl

3 2

(c) CH ClCHClCH Cl

2 2

.. (d) All the three 85. PVC is obtained from vinyl chloride by a reaction

called

(a) Addition (b) Isomerization

(c) Polymerization (d) Substitution

86. Reaction of

2

Br on ethylene in presence of NaCl

gives

(a) BrCH CHBr

2 2

 (b) ClCH CH Br

2 2

(c) Both (a) and (b) (d) None of these

3 2

CHCHCHHBr  the product

formed is [AIIMS 1983; CPMT 1997; RPMT 1999, 2003]

(a) CHCHCHBr

3 2 2

(b)

3 3

CHCHBrCH

(c)

2 2

BrCHCHCH (d)

2 2

CH  C  CH

88. The product of reaction between propene and HBr

in the presence of a peroxide is

(a) CH CH CH Br

3 2 2

(b)

3 3

CHCHBrCH

(c) CH CHBr

3 2

 (d) CHCHCHBr

3

89. Ozonolysis of 2-methyl butene-2 yields

(a) Only aldehyde

(b) Only ketone

(c) Both aldehyde and ketone

(d) None of these

90. The final product formed by the ozonolysis of

compound

2

RCHCR is [NCERT 1978]

(a) RCHO (b) RCO

2

(c) Both (a) and (b) (d) None of these

91. Which one is an unsaturated compound [BIT 1990]

(a)

6 14

CH

(b)

4 8

CH

(c) C HOH

3 7

(d) CH OH

3

92. Ethyl alcohol on heating with conc.

2 4

HSO gives

[EAMCET 1979; MP PMT 1996]

(a)

3 2 5

CHCOOCH (b)

2 6

CH

(c)

2 4

CH (d)

2 2

CH

93. Monohalides on reacting with alcoholic KOH give

[MP PET 1982, 86; DPMT 1981; CPMT 1979, 83]

(a) Alkanes (b) Alkenes

(c) Alkynes (d) Aromatic

hydrocarbons

94. Ethylene is a member of..... series [BHU 1979]

(a) Alkyne (b) Olefin

(c) Paraffin (d) Amine

95. In a double bond between two carbon atoms of

ethene, there are [NCERT 1981]

(a) Two sigma bonds perpendicular to each other

(b) One sigma and one pi bond

(c) Two pi bonds perpendicular to each other

(d) Two pi bonds at an angle of

o

60

96. The formation of alkene from alkyl halide is an

example of

[CPMT 1983; AMU 1982; Pb. CET 1986]

(a) Addition (b) Elimination

(c) Substitution (d) (a) and (c)

97. In the following reaction

K

HSO

CH CH CH CH

475

3 2 2 3

2 4

     [AIIMS 1983]

(a)

3 3

CH CH  CHCH

predominates

(b)

2 2 3

CHCHCH CH predominates

(c) Both are formed in equal amounts

(d) The amount of production depends on the

nature of catalyst

98. The compound B formed in the following

sequences of reactions is

CH CH CHOH A B

PCl AlcoKOH

    

.

3 2 2

3

[NCERT 1981]

(a) Propyne (b) Propene

(c) Propanol (d) Propane

99. n - propyl bromide on treatment with ethanolic

potassium hydroxide produces [IIT-JEE 1987; MP PMT 1997]

(a) Propane (b) Propene

(c) Propyne (d) Propanol

100. The dehydrohalogenation of neopentyl bromide

with alcoholic KOH mainly gives

[IIT-JEE (Screening) 1990; MP PET 1993]

(a) 2 - methyl- 1 - butene (b) 2 - methyl- 2 - butene

(c) 2, 2-dimethyl- 1 - butene (d) 2 - butene

101. Which is the most reactive hydrocarbon in the

following

4

2 2

(ii)

() ( );

3

|

3

|

3 2

NaBH

iHgOAc HO

CH

CH

CHCCHCH  

[MP PMT 1986; MP PET 1997]

(a)

CH OH

CH

CH C CH CH

3

| |

2

|

3 2

(b)

3

|

3

|

3 2 2

CH

CH

CHCCHCHOH

(c)

3

|

3

| |

3 3

CH

OHCH

CHCCHCH

(d)

3

|

3

|

2 2 2

CH

CH

HOCHCCHCH

120. Which one of the following organic compounds

decolourizes an alkaline

4

KMnO solution [CPMT 1987, 93]

(a)

2

CS (b)

3 6

CH

(c)

3 8

CH (d) CH OH

3

121. Decolourization of alkaline

4

KMnO

is used as a

test for

[AMU 1983]

(a) Aromatic hydrocarbons

(b) Olefinic hydrocarbons

(c) Acetylenic hydrocarbons

(d) Cycloalkanes

122. The reaction

3 3

250300

2 2 2

CH CH H CH CH

C

Ni

o

is called

[MP PMT 1996; CBSE PMT 2001; MH CET 2001;

BHU 2002]

(a) Wurtz's reaction

(b) Kolbe's reaction

(c) Sabatier and Senderen's reaction

(d) Carbylamine reaction

123. The alkene which on ozonolysis yields acetone is

[MP PMT 1986, 2000]

(a)

2 2

CH  CH

(b)

3 2

CH  CH  CH

(c)

3 2 32

( CH ) C  C ( CH )

(d)

3 3

CH  CH  CH  CH

124. CH CH  CHCHO

3

is oxidized to

CH CH  CHCOOH

3

using [NCERT 1978]

(a) Alkaline potassium permanganate

(b) Acidified potassium permanganate

(c) Selenium dioxide

(d) Osmium tetroxide

125. The order of increasing reactivity towards HCl of

the following compounds will be

2 2

CH  CH

3 2 2

( CH ) C  CH

3 3

CH CH  CHCH

[MP PET 1994]

(a) 1  2  3 (b) 1  3  2

(c) 3  2  1

(d) 2  1  3

126. The reagent which is used to distinguish between

propene and propyne is [MP PET 1994; IIT-JEE (Screening) 2000;

AIIMS 2000; Pb. PMT 2002; BHU 2003]

(a) Bromine (b) Alkaline

4

KMnO

(c) Ammoniacal

3

AgNO (d) Ozone

127. Which one of the following reactions would be the

best for the formation of 2 - bromobutane [MP PET 1994]

HBr

CH CH CHCH CH

3 2 3

HBr

CH CHCH CH

3 2 2

2

3 3

Br

CHCH CHCH

Peroxide

3 2 2

HBr

CHCHCH CH

(a) 1 (b) 2

(c) 3 (d) 4

128. If HCl is added over

3

3

2

CH

CH

CHC then

what is formed [CPMT 1996]

(a)

3

3

|

2

CH

CH

CH

Cl

CH

(b)

Cl

CH

CH CH CH

3

2 3

(c)

3

2

2

CH

CHCl

CHC

(d) None of these

129. Position of double bond in an organic compound is

determined by [DCE 2001; RPMT 2002]

(a) Ozonolysis (b) Oxidation

(c) Reduction (d) Hydrogenation

130. A gas decolourises Bayer's reagent but does not

react with Tollen's reagent, this gas is [MP PMT 2001]

(a) Ethene (b) Ethyne

(c) Ethane (d) Methane

131. Formation of 2 - butene from 2 - bromobutane is

according to

(a) Markowikoff’s (b) Bayer

(c) Saytzeff (d) Wurtz

132. An alkene on ozonolysis gave acetaldehyde the

alkene is

(a) Ethylene (b) Propene

(c) 1 - butene (d) 2 - butene

133. Indicate the organic structure for the product

expected when 2-methyl propene is heated with

acetyl chloride in presence of anhydrous zinc

chloride [CBSE PMT 1989]

(a)

Cl

CH

CH C CH CO CH

|

3

|

3 2 3

   

(b)

3

|

|

3 2 3

CH

H

CHCCHCOCH

(c)

O

CH C O C

||

3

(d)

2

3

|| |

3

CH

CH

C

O

CHC  

134. The reaction

3

|

3 2

|

3

|

3 3

2 4

CH

CH C CH

OH

CH

CH C CH

H SO

is the example of [AMU 1983]

(a) Sulphonation (b) Dehydration

(c) Alkylation (d) Decomposition

135. Olefins can be hydrogenated by [AIIMS 1991]

(a) Zinc and HCl

(b) Nascent hydrogen

(c) Raney Ni and

2

H (d) Lithium hydride in

ether

136. Electrolysis of cold concentrated aqueous solution

of potassium succinate yields [CPMT 1985; MP PMT 1986]

(a) Ethane (b) Ethyne

(c) Ethene (d) Ethane-1, 2-diol

137. A hydrocarbon containing 2 carbon atoms gives

Sabatier and Senderen's reaction but does not

give precipitate with ammoniacal silver nitrate

solution. The hydrocarbon in the question is [MADT Bihar 1983]

(a) Ethane (b) Acetylene

(c) Ethylene (d) None of these

138. The reaction

2 3 3 3

CHCHCHHBrCHCHBrCH

is

[CBSE PMT 1996]

(a) Nucleophilic addition (b)Electrophilic addition

(c) Electrophilic substitution (d) Free radical addition

139. What is the product of the reaction of 1, 3 -

butadiene with Br 2 [Orissa JEE 2003]

(a) 1,4 – dibromobutene (b) 1,2 - dibromobutene

(c) 3,4-dibromobutene (d) 2,3-dibromo- 2 -

butene

140. An alkene given two moles of HCHO , one mole of

2

CO and one mole of CH COCHO

3

on ozonolysis.

What is its structure [Orissa JEE 2003]

(a)

2 2 3

CH  C  CH  CH  CH

(b)

2

3

|

2

CH CH

CH

CHCHCH  

(c)

3

3

|

2

CH

CH

CH  C  C 

(d)

2

3

|

2

CH CH

CH

CH  C  C  

141. In the reaction

Acid

KMnO

CH CH  CH  HO  O  

4

[ ]

3 2 2

X HCOOH

OH

CH

OH

CH CH

O

    

[]

2

|

|

3

X is [MP PMT 200

(a) CH CHCOOH

3 2

(b) CHCOOH

3

(c) CH CHCHO

3 2

(d) CH CHOH

3 2

142. Which of the following alkenes gives only acetic

acid and on oxidation with potassium

permanganate solution

[MP PET 2003]

(a) Ethylene (b) 1 - Butene

(c) Propene (d) 2 - Butene

143. Butene-1 may be converted to butane by reaction

with

[AIEEE 2003]

(a) Zn - HCl (b) Sn - HCl

(c) Zn - Hg (d) Pd /

2

H

144. The major product formed when propene reacts

with HBr in presence of peroxides is [NCERT 1980; CBSE PMT 1989]

(a) n - propyl bromide (b) Isopropyl bromide

(c) n- propyl alcohol (d) 1, 3-dibromopropane

145. Ethyl hydrogen sulphate is obtained by the

reaction of

2 4

HSO

on [CPMT 1985]

(a) Ethylene (b) Ethane

(c) Ethyl chloride (d) Ethanol

146. Ethylene reacts with ozone to give [DPMT 1981]

(a) Formaldehyde (b) Ethyl alcohol

(c) Ozonide (d) Acetaldehyde

147. Which of the following aliphatic compounds will

discharge red colour of bromine

(a)

2 4

CH (b)

3 6

CH

(c)

4 8

CH (d) All of these

148. Chlorination can be done on

(a)

3 2

CHCHCH (b)

2 2

CH  CH

(c) CHCH (d) None of these

149. Addition of HI on the double bond of propene

yields isopropyl iodide and not n - propyl iodide as

the major product. This is because the addition

proceeds through

Me

Me

Me

(a)

2 6

CH

(b)

4

CH

(c)

2 4

CH (d)

2 2

CH

169. 3 - Phenylpropene on reaction with HBr gives (as a

major product) [AIIMS 2005]

(a)

6 5 2 3

CHCHCH ( Br ) CH

(b)

6 5 2 3

CHCH ( Br ) CHCH

(c) C HCHCHCHBr

6 5 2 2 2

(d)

6 5 2

C HCH ( Br ) CHCH

170. Reaction of one molecule of HBr

with one

molecule of 1,3-butadiene at C

o

40 gives

predominantly [AIEEE 2005]

(a) 3 - bromobutene under kinetically controlled

conditions

(b) 1 - bromo- 2 - butene under thermodyanamically

controlled conditions

(c) 3 - bromobutene under thermodynamically

controlled conditions

(d) 1 - bromo- 2 - butene under kinetically controlled

conditions

171. The only alcohol that can be prepared by the

indirect hydration of alkene is [AFMC 2005]

(a) Ethyl alcohol (b) Propyl alcohol

(c) Isobutyl alcohol (d) Methyl alcohol

172. The reaction of HBr with

3

|

3 2

CH

CHCCH in the

presence of peroxide will give [BHU 2005]

(a)

3

|

3 3

CH

CH CBrCH (b) CH 3 CH 2 CH 2 CH 2 Br

(c)

3

|

3 2

CH

CHCHCH Br (d)

3

|

3 2 3

CH

CHCHCHCH

173. A gas decolourised by

4

KMnO solution but gives

no precipitate with ammoniacal cuprous chloride

is

[KCET 2005]

(a) Ethane (b) Methane

(c) Ethene (d) Acetylene

174. Cyclohexene on reaction with 4

OsO followed by

reaction with

3

NaHSO gives [Orissa JEE 2005]

(a) cis-diol (b) trans-diol

(c) epoxy (d) alcohol

Alkyne

1. Which of the following gases is used for welding

[CPMT 1996]

(a) Methane (b) Ethane

(c) Acetylene (d) Ethene

2. A metallic carbide on treatment with water gives

a colourless gas which burns readily in air and

which gives a precipitate with ammoniacal silver

nitrate solution. Gas evolved is

[NCERT 1975; CPMT 1977; MP PET 2002]

(a) Methane (b) Ethane

(c) Acetylene (d) Ethylene

3. 1 - butyne reacts with cold alkaline

4

KMnO

to

produce

[AIIMS 1997]

(a) CH CHCOOH

3 2

(b) CH CHCHCOOH

3 2 2

(c)

3 2 2

CH CHCOOH  CO

(d) CH CHCOOHHCOOH

3 2

4. Identify the product D in the following series of

reaction

CH COOH A B C D

KOH

Br alc

K

LiAlH H

       

.

443

3

4 2

[CBSE PMT 1998]

(a) Methane (b) Alcohol

(c) Acetylene (d) Benzaldehyde

5. The correct order towards bond length is

[RPMT 1997]

(a) CCCCCC (b) CCCCCC

(c) CCCCCC (d) CCCCCC

6. In the molecule

2

CHCCHCH , the

hybridisation of CC bond is [Oris

(a) spsp

2

(b)

3 3

spsp

(c)

2 2

spsp (d) spsp

3

7. The product formed when acetylene is passed

through red hot tube is [BHU 1989; RPMT 2003]

(a) Benzene (b) Cyclohexane

(c) Neoprene (d) Ethane

8. Acetylenic hydrogens are acidic because

[CBSE PMT 1989; Pb. PMT 1999]

(a) Sigma electron density of C–H bond in

acetylene is nearer to carbon, which has 50%

s- character

(b) Acetylene has only one hydrogen on each

carbon

(c) Acetylene contains least number of hydrogens

among the possible hydrocarbons having two

carbons

(d) Acetylene belongs to the class of alkynes with

molecular formula

n 2 n  2

CH

9. Which is the most suitable reagent among the

following to distinguish compound (iii) from rest

of the compounds

(i)

3 3

CH  C  C  CH

(ii)

3 2 2 3

CH  CH  CH  CH

(iii) CHCHCCH

3 2

(iv)

3 2

CH  CH  CH [CBSE PMT 1989]

(a) Bromine in carbon tetrachloride

(b) Bromine in acetic acid

(c) Alkaline

4

KMnO

(d) Ammoniacal silver nitrate reagent

10. A hydrocarbon of formula 6 10

CH absorbs only one

molecule of

2

H upon catalytic hydrogenation.

Upon ozonolysis, the hydrocarbon yields

H

CH C O

H

O C CH CH CH

|

2

|

2 2 2

      

The hydrocarbon is [MP PMT 1986]

(a) Cyclohexane (b) Benzene

(c) Cyclohexene (d) Cyclobutane

11. Poisonous gas ‘Lewissite’ is obtained by the

reaction of

[MP PMT 2003]

(a) CHCH

and

3

AsCl

(b)

2 2

CHCH and

3

AsCl

(c) CHCH and

2 2

SCl

(d)

2 2

CHCH and NOCl

12. Products of the following reaction

3

( 1 )

( 2 )

3 2 3

O

Hydrolysis

CH CCCH CH   ....... are

[CBSE PMT 2005]

(a) CH CHO CHCHCHO

3 3 2

(b) CH COOH CHCHCHO

3 3 2

(c)

3 2 3

CH COOH  HOOCCHCH

(d)

3 2

CH COOH  CO

13. By coaltar distillation, which is not obtained

[SCRA 1990; MP PMT 1986]

(a) Light oil (b) Middle oil

(c) Heavy oil (d) Mobil oil

14. Hydrocarbon containing following bond is most

reactive

[AIIMS 1987]

(a) CC (b) C = C

(c) C – C (d) All of these

15. The shapes of methane, ethene and ethyne

molecules are, respectively

(a) Tetrahedral, planar and linear

(b) Tetrahedral, linear and planar

(c) Pyramidal, planar and linear

(d) Tetrahedral, pyramidal and planar

16. To synthesize the unsymmetrical alkyne

3 2 3

CHCCCHCH the reagents needed

would be

(a) Ethene, iodoethane, iodomethane and

potassium hydroxide

(b) Acetaldehyde, 1 - bromopropane and conc.

2 4

HSO

(c) 1, 2-dichloroethane, 1-propanol and alcoholic

potassium hydroxide

(d) Ethyne, iodomethane, iodoethane and

sodamide

17. When propyne is treated with dilute

2 4

HSO and

4

HgSO , the major product is [Kurukshetra CEE 2002]

(a) Propanal

(b) Propanol

(c) Propyl hydrogen sulphate

(d) Propanone

18. Which of the following will be the final product

when

2 2

CH reacts with HCl

[DPMT 1984; AFMC 1982; Bihar MEE 1982]

(a)

CHCl

CH

| | (b)

2

3

CHCl

CH

(c)

CHCl

CHCl

| | (d) None of these

19. What is the end product of the following

sequences of operations

CaC A B C

H

Ni

Hg

HO HSO

2

2 2 4

dil.

2

     



[CPMT 1978; MP PMT 1996]

(a) Methyl alcohol (b) Acetaldehyde

(c) C HOH

2 5

(d)

2 4

CH

20. RCHCClR   RCCR

Reagent

2 2

The reagent is [CBSE PMT 1989; MP PET 1995]

(a) Na (b) HCl HO

2

and

(c) KOH CHOH

2 5

in (d) Zn

21. Acetylene can be prepared from [CPMT 1988]

(a) Potassium fumarate (b) Calcium carbide

(c) Ethylene bromide (d) All of these

22. Acetylene is obtained by the electrolysis of [BHU 1986]

(a) Sodium succinate (b) Potassium fumarate

(c) Both (a) and (b) (d) None of these

23. The compound

3 4

CH has a triple bond, which is

indicated by its reaction with [MP

(a) Bromine water (b) Bayer's reagent

(c) Fehling solution (d) Ammonical silver

nitrate

CH CH X Y Z

LiAlH P Br

HSO

H OHg

      

4 4 2

2 4

2

2

/ /

Here Z

is

[JIPMER 2002]

(a) Ethylene bromide (b) Ethanol

(c) Ethyl bromide (d) Ethylidene bromide

Pressure

( )

2

CH CH X

Ni CN

  . Here X in the reaction