Question

Given below are two statements
Statement I:
Primary aliphatic amines react with $HN{O}_2$ to give unstable diazonium salts.
Statement II:
Primary aromatic amines react with $HN{O}_2$ to form diazonium salts which are stable even above $300\text{K}$. In the light of the above statements, choose the most appropriate answer from the options given below.

• A. Statement I is incorrect but Statement II is correct.
• B. Statement I is correct but Statement II is incorrect.
• C. Both Statement I and Statement II are correct
• D. Both Statement I and Statement II are incorrect.

Answer 1

The correct option is B Statement I is correct but Statement II is incorrect.

• Primary aliphatic amines form highly unstable alkanediazonium salts. They rapidly decompose even at temperatures < (273 K) forming carbocations and nitrogen gas.
• Primary aromatic amines form arenediazonium salts,which are stable for a short time in solution at lower temperatures (273-278K).
• The aromatic diazonium salts are unstable above $300\text{K}$.

Hence, Statement-I is correct & statement II is incorrect.