Which of the following amines will not give N_2 gas on treatment with nitrous acid (NaNO_2+ . HCl) ?

Correct answer: (D) All will give N_2 .. All aliphatic primary amines liberate N_2 gas on treatment with HNO_2 . R-NH_2+HONO stackrel273-278 ~Klongrightarrow R-OH+N_2+H_2 O Since no other class of amines liberate N_2 gas on treatment with HNO_2 , this reaction is used as a test for aliphatic primary amines.

Q31 / 180 · AIIMS 2007 · Chemistry

Which of the following amines will not give \(\mathrm{N}_2\) gas on treatment with nitrous acid \(\left(\mathrm{NaNO}_2+\right.\) \(\mathrm{HCl})\) ?

A
\(\mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2\)
B
\(\mathrm{CH}_3 \mathrm{NH}_2\)
C
\(\left(\mathrm{CH}_3\right)_2 \mathrm{CH}-\mathrm{NH}_2\)
Correct answer
D
All will give \(\mathrm{N}_2\).

Solution

All aliphatic primary amines liberate \(\mathrm{N}_2\) gas on treatment with \(\mathrm{HNO}_2\). \(R-\mathrm{NH}_2+\mathrm{HONO} \stackrel{273-278 \mathrm{~K}}{\longrightarrow} R-\mathrm{OH}+\mathrm{N}_2+\mathrm{H}_2 \mathrm{O}\) Since no other class of amines liberate \(\mathrm{N}_2\) gas on treatment with \(\mathrm{HNO}_2\), this reaction is used as a test for aliphatic primary amines.

Hence, the correct answer is option: 'D'.

Which of the following amines will not give \(\mathrm{N}_2\) gas on treatment with nitrous acid \(\left(\mathrm{NaNO}_2+\right.\) \(\mathrm{HCl})\) ?

Solution

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