Aniline is converted into benzenediazonium chloride by treating it with

A $NaNO X_{2}$ / dil. $HCl$ at 330 K
B $NaNO X_{2}$ / dil. $HCl$ at 273-278 K
C $Sn / HCl$
D $CHCl X_{3} + KOH$ (ethanolic)

Answer: B

Diazotisation of a primary aromatic amine uses nitrous acid generated in situ from sodium nitrite and HCl, kept at 273-278 K because the diazonium salt decomposes at higher temperature. CHCl3/KOH is the carbylamine test and Sn/HCl is a reducing agent.

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Aniline is converted into benzenediazonium chloride by treating it with

Answer: B

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