Question

Which of the following is an incorrect statement about benzenediazonium chloride ?

• A. It is prepared by the reaction of aniline with nitrous acid at 273-278 K
• B. It is a colourless crystalline solid
• C. Alkyl diazonium salts are more stable than arenediazonium salts
• D. Benzene diazonium fluoroborate is water insoluble & stable at room temperature

Answer 1

The correct option is C Alkyl diazonium salts are more stable than arenediazonium salts

Diazonium ions are prepared by diazotisation, a procedure in which a primary aromatic amine $\left(ArN{H}_2\right)$ is treated with a source of nitrous acid $\left(HN{O}_2\right)$. Typically this involves adding sodium nitrite $\left(NaN{O}_2\right)$ to an aqueous acidic solution containing the amine.

Aniline $\left(C_6{H}_{5}N{H}_2\right)$ forms stable diazonium salt at 273 K as it undergoes resonance stabilization. Aryldiazonium ions have more contributing structure than any other option