Which of the following compounds is an enol of compound X drawn below? A. Compou

Question

Which of the following compounds is an enol of compound X drawn below? A. Compounds A and B are both enols of X. B. A C. Compounds A, B, and C are all enols of X. D. C E. B In several reactions of carbonyl compounds that we have studied the reactions are reversible. Which reaction listed below is not reversible? A. Claisen condensation B. Amide hydrolysis in base C. Ester hydrolysis in acid D. Dieckman condensation E. Aldol condensation An amine with three different substituents is a stereogenic center, so why do we not have to worry about there being two enantiomers? A. There is rapid inversion at nitrogen, so the two forms interconvert. B. There must be four bonds to have a chiral center. C. Enantiomers only occur at carbon. D. It isn't an alkene. Rank the following three compounds in order of decreasing acidity. A. II > III > I B. III > II > I C. II > I > III D. III > I > II

Explanation / Answer

17) answer = option A = compound A and B both are enolos of X

18) option E aldol condensation.

in strong base like LDA aldol reaction is irreversible.

19) answer = option A there is rapid interconversion of N

20) option C II > I > III

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