The Hinsberg reagent is:

Abenzenesulfonic acid, $C X_{6} H X_{5} SO X_{3} H$
Bbenzenesulfonyl chloride, $C X_{6} H X_{5} SO X_{2} Cl$
Cbenzoyl chloride, $C X_{6} H X_{5} COCl$
Dacetyl chloride, $CH X_{3} COCl$

Answer: B

Hinsberg reagent is benzenesulfonyl chloride, used to separate primary, secondary and tertiary amines by the solubility behaviour of the sulfonamides in aqueous alkali.

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