Question

Primary amines on reaction with nitrous acid form _________. For the test of primary amines _________ reaction is used. Primary amines are __________ basic than ammonia.

• A. carboxylic acids, hoffmann, less
• B. secondary alcohols, carbylamine, less
• C. primary alcohols, carbylamine, more
• D. hydroxylamines, carbylamine, less

Answer 1

Answer: (C)

primary alcohols, carbylamine, more

Primary amines on reaction with nitrous acid form primary alcohols.

$RN{H}_2+HONO\to ROH+H_{2}O+N_2$

For the test of primary amines, carbylamine reaction is used.

$RN{H}_2\stackrel{CHC{l}_3,KOH}{\to }R-N\equiv C$

Primary amines are more basic than ammonia, as primary amines consist of one $-R$ group which gives electrons to $N$ atom, thereby the freely available electrons on the nitrogen increases, therefore basicity increases.