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  4. In diazotisation reaction of aniline with NaNO2 and HCl, an excess of HCl is used to

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Q. In diazotisation reaction of aniline with $NaNO_2$ and $HCl$, an excess of $HCl$ is used to

Amines

Solution:

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