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NEET levelSingle correct optionDifficulty 1 of 3nc059

Aniline is diazotised with $NaNO X_{2}$ and dil. $HCl$ at 273-278 K rather than at about 330 K mainly because

Aaniline hydrochloride is insoluble in water above 278 K
Bthe benzene ring of aniline is nitrated by $NaNO X_{2}$ at higher temperature
Cbenzenediazonium chloride decomposes at higher temperature (to phenol and $N X_{2}$ ), lowering the yield
Danilinium chloride is oxidised to nitrobenzene by $NaNO X_{2}$ above 278 K

Answer: C

Aryldiazonium salts are stable only in the cold; above about 283 K they react with water to give phenol and

N X_{2}

. Keeping the mixture at 273-278 K preserves the diazonium salt for the next step.

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