Discussion
The correct formula of Hinsberg's reagent is
Answer: A
Hinsberg's reagent is C6H5SO2Cl, benzenesulphonyl chloride.
It is used to distinguish primary, secondary and tertiary amines: primary amines give a sulphonamide soluble in alkali, secondary amines give one insoluble in alkali, and tertiary amines do not react.
The other formulae do not represent benzenesulphonyl chloride: C6H5SOCl has one oxygen too few, C6H5SO3Cl one too many, and the dichloride formulae carry an extra chlorine.
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