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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
C C (b)
10 12
C C
(c)
5 9
C C (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
CH C
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
CH CH CH CH . 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
- 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
CO CO (b)
2
CO N
(c)
2
CO H (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
CH C CH
and on CH CH will predominantly give the
compounds, respectively
(a)
3
|
3 2
CH
CH CH CHCl and CH Cl CHCl
2 2
(b)
3
|
3 3
CH
CH CCl CH and
3 2
CH CHCl
(c)
3
|
3 2
CH
CH CH CHCl and
3 2
CH CHCl
(d)
3
|
3 3
CH
CH CH CH 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
CH CH CH Br
(b)
3
|
3 2
CH
CH CH CH Br
(c)
3
|
3
|
3
CH
CH
CH C Br
(d) CH CH CH CH Br
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
CH CH CH CH CH
(c)
2 4
CO H CH (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) Zn Hg / 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
CH Cl CHCl HCl
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
CH CO CH (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 R CH CH R to give [Roorkee 1992]
(a) R – CHO (b) R – COOH
(c) RCHOH – CHOHR (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
CH CH alcoKOH
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 HCH CH H X 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 R X Nu 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
CH C CH
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 CH CH CH C CH
2 2
gives
[Roorkee Qualifying 1998]
(a) CH CH CH CBr CHBr
2 2
(b) BrCH CHBr CH C CH
2 2
(c)
2 2 2 3
CH CH CH CH CBr
(d) CH CBr CH C CH
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
R C H CH reacts readily with
2 6
BH
and the product on oxidation with alkaline
hydrogen peroxides produces [CBS
(a) R CH CHO
2
(b) R CH CH OH
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. CH CH (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
CH CH CH HBr the product
formed is [AIIMS 1983; CPMT 1997; RPMT 1999, 2003]
(a) CH CH CH Br
3 2 2
(b)
3 3
CH CHBr CH
(c)
2 2
BrCH CH CH (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
CH CHBr CH
(c) CH CHBr
3 2
(d) CH CH CHBr
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
RCH CR 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
CH CHCH 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
CH C CH CH
[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
CH C CH CHOH
(c)
3
|
3
| |
3 3
CH
OHCH
CH C CH CH
(d)
3
|
3
|
2 2 2
CH
CH
HOCH C CH CH
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
CH C 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
CH C
(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
CH C CH CO CH
(c)
O
CH C O C
||
3
(d)
2
3
|| |
3
CH
CH
C
O
CH C
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
CH CH CH HBr CHCHBr CH
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
CH CH CH
(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
CH CH CH (b)
2 2
CH CH
(c) CH CH (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 ) CH CH
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
CH C CH 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 CHCOOH HCOOH
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) C C C C C C (b) C C C C C C
(c) C C C C C C (d) C C C C C C
6. In the molecule
2
CH C CH CH , the
hybridisation of C C bond is [Oris
(a) sp sp
2
(b)
3 3
sp sp
(c)
2 2
sp sp (d) sp sp
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) CH CH C CH
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) CH CH
and
3
AsCl
(b)
2 2
CH CH and
3
AsCl
(c) CH CH and
2 2
SCl
(d)
2 2
CH CH and NOCl
12. Products of the following reaction
3
( 1 )
( 2 )
3 2 3
O
Hydrolysis
CH C CCH 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) C C (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
CH C C CH CH 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. R CH CCl R R C C R
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
