Question

In diazotisation reaction of aniline with $NaN{O}_2$ and $HCl$, an excess of $HCl$ is uesd to:

• A. suppress the formation of acetanilide
• B. suppress the concentration of free aniline available for coupling
• C. maintain the pH of the reaction
• D. prevent the formation of anilinium ion

Answer 1

The correct option is B suppress the concentration of free aniline available for coupling

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