Question

In diazotization reaction of aniline with $NaNO_{2}$and HCl, an excess of HCl is used to

• A. Suppress the formation of acetanilide
• B. Suppress the concentration free aniline available for coupling
• C. Maintain the pH of the reaction
• D. Prevent the formation of anilinium ion.

Answer 1

Answer: (B)

Suppress the concentration free aniline available for coupling

Answer 2

: Excess of hydrochloric acid avoids the possibility of coupling reaction by leaving no aniline for coupling reaction.