Question

Choose the amide which on reduction with $LiAl{{H}_{4}}$ yields a secondary amine

• A. Ethanamide
• B. $N$-Methylethanamide
• C. $N, N$-dimethylethanamide
• D. Phenylmethanamide

Answer 1

Answer: (B)

$N$-Methylethanamide

Answer 2

Secondary amides such as N-methylethanamide on reduction with $LiAl{{H}_{4}}$ give secondary amines.
$\underset{N\text{ }-methylethanamide}{\mathop{C{{H}_{3}}CONHC{{H}_{3}}}}\,+[H]\xrightarrow{LiAl{{H}_{4}}}$ $\underset{2{}^\circ \text{ }amine}{\mathop{C{{H}_{3}}C{{H}_{2}}NHC{{H}_{3}}}}\,+{{H}_{2}}O$