Question

Write the reactions of aromatic and aliphatic primary amines with nitrous acid

Answer 1

Answer

(i) Aromatic amines react with nitrous acid (prepared in situ from NaNO2 and a mineral acid such as HCl) at 273 - 278 K to form stable aromatic diazonium salts i.e., NaCl and H2O.

(ii) Aliphatic primary amines react with nitrous acid (prepared in situ from NaNO2 and a mineral acid such as HCl) to form unstable aliphatic diazonium salts, which further produce alcohol and HCl with the evolution of N2 gas.

Answer 2

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●Aromatic primary amines react with $HNO_2$ at 273–278 K to form aromatic diazonium salts.

●Aliphatic primary amines also react with $HNO_2$ at 273–278 K to form aliphatic diazonium salts. However, these are unstable even at low temperature and therefore, decompose readily to form alcohols (generally predominate) and $N_2$ is evolved.