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  4. Primary and secondary amines are distinguished by

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Q. Primary and secondary amines are distinguished by

Amines

Solution:

Primary and secondary amines are distinguished by nitrous acid $HNO _{2}$
Primary amines when reacted with nitrous acid forms alcohols and secondary amines when reacted with nitrous acid forms N-nitroso derivative.
$1^{0}$ Amines: $R - NH _{2} \xrightarrow{HNO _{2}} R - N ^{+} \equiv NX ^{-} \rightarrow R ^{+} \rightarrow R - OH$ (alcohol)
$2^{0}$ Amines: $R _{2}- NH \xrightarrow{HNO _{2}} R _{2}- N - NO$ (N - nitroso derivative)