Question: 67: Given below are two statements
Statement I:
Primary aliphatic amines react with \mathrm{HNO}_{2} to give unstable diazonium salts.
Statement II:
Primary aromatic amines react with \mathrm{HNO}_{2} to form diazonium salts which are stable even above 300 K . In the light of the above statements, choose the most appropriate answer from the options given below
(1) Statement I is correct but Statement II is incorrect.
(2) Statement I is incorrect but Statement II is correct.
(3) Both Statement I and Statement II are correct.
(4) Both Statement I and Statement II are incorrect.
Answer: Option (1)
Explanation:
Primary aliphatic amines react with nitrous acid \mathrm{HNO}_{2}
at low temperature to form aliphatic diazonium salts.
These aliphatic diazonium salts are highly unstable and decompose immediately,
releasing nitrogen gas and forming alcohols.
Therefore, Statement I is correct.
Primary aromatic amines react with nitrous acid \mathrm{HNO}_{2}
at low temperature to form aromatic diazonium salts.
Aromatic diazonium salts are relatively stable only at low temperatures,
typically below 273–278 \, \mathrm{K}.
Above 300 \, \mathrm{K}, aromatic diazonium salts decompose readily.
Hence, Statement II is incorrect.
Therefore, the correct answer is that Statement I is correct but Statement II is incorrect.