Quiz 3 (ch 18, 19) CH232 July 21, 2009 Blackstock
1. Many nucleophilic addition reactions of aldehydes and ketones are catalyzed by acid or base. Bases catalyze hydration by :
a. making the carbonyl group more electrophilic
b. shifting the equilibrium of the reaction
c. making the carbonyl group less electrophilic
d. converting the water to hydroxide ion, a much better nucleophile
2. The reaction of an aldehyde with hydrogen cyanide is an example of ________ reaction.
a. a nucleophilic substitution
b. an electrophilic addition
c. an electrophilic substitution
d. a nucleophilic addition
Choose the BEST r eagent for carrying out each of the following convers ions.
3.
A. LiAlH4, THF, then H3O+ B. NaBH4, ethanol
C. 1. DIBAH, toluene D. All of the above work well
2. H3O+
4.
A. 1. PhMgBr, ether B. 1. PhCH2MgBr, ether
2. H3O+ 2. H3O+
C. (C6H5)3P=CHC6H5, THF D. Li(C6H5)2Cu, ether
5. What would be a suitable solvent for the preparation of ethylmagnesium bromide from ethyl bromide and
magnesium?
A. CH3CO2CH2CH3 B. CH3CH2OH
C. CH3CO2H D. CH3OCH2CH2OCH3
6.
OCH3
O
H
O
O
