Question

Identify and in the following reactions: 

Hint:

Dehydration of amides with \( P_2O_5 \) forms isocyanides, which can be reduced to primary amines using catalytic hydrogenation.

Answer 1

Step 1: The given reaction sequence suggests dehydration followed by reduction. - Dehydration of acetamide (\( CH_3CONH_2 \)) using \( P_2O_5 \) forms methyl isocyanide (\( CH_3NC \)). \[ CH_3CONH_2 \xrightarrow{P_2O_5, \Delta} CH_3NC \] So, (A) = Methyl isocyanide (\( CH_3NC \)). 

Step 2: The second step is catalytic reduction using Sn/HCl. - Reduction of methyl isocyanide leads to the formation of **methyl amine** (\( CH_3CH_2NH_2 \)). \[ CH_3NC \xrightarrow{4[H], Sn/HCl} CH_3CH_2NH_2 \] So, (B) = Methyl amine (\( CH_3CH_2NH_2 \)).