Choose the amide which on reduction with LiAlH_4 yields a secondary amine.

MHT CET Chemistry question

Choose the amide which on reduction with yields a secondary amine.

(A)ethanamide
(B)N-methylethanamideCorrect
(C)N,N-dimethylethanamide
(D)phenylmethanamide

Answer: (B)

Solution

LiAlH4 converts C(=O)-N into CH2-N, keeping the number of groups on N: ethanamide gives CH3CH2NH2 (primary), N-methylethanamide CH3CONHCH3 gives CH3CH2NHCH3

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Question ID VK-082441