Question

Which of the following diazonium salt is stable at room temperature?

• A.
• B.
• C.
• D. None of the above

Answer 1

The correct option is B

Aliphatic diazonium salts are highly unstable.
Aromatic diazonium salts are more stable than aliphatic at low temperature $(0-5^{o}C)$ due to the resonance.
Due to resonance, partial double bond character is present between C and N in benzenediazonium cation, thus, removal of $-N_2$ is difficult.


Only one type of diazonium salt is stable at room temperature and it is benzenediazonium fluoroborate.

Hence, option (b) is correct.