Question

Diazonium salt is obtained when aniline reacts with

• A. cold NaOH
• B. $ NaNO_{2} $ and $ HCl\,(0-5^{\circ}C) $
• C. $ SnCl_{2} $ at $ 10^{\circ}C $
• D. $ N_{2}O $ at $ (0-5^{\circ}C) $

Answer 1

Answer: (B)

Diazodsadon : Benzene diazonium chloride is prepared by treating aniline with sodium nitrite and hydrochloric acid at $ 0^{\circ}C-5^{\circ}C $ . This reaction is called diazotisation.
$ NaNO_{2}+HCl\rightarrow NaCl+HNO_{2} $