Which of the following statements is correct?

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(A) The Hinsberg reagent is benzenesulfonyl chloride $(C_6H_5SO_2Cl)$.It reacts with $1^o$ amines to form a sulfonamide that is soluble in alkali.It r

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Hinsberg reagent can be used to separate $1^o, 2^o$ and $3^o$ amines.

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(A) The Hinsberg reagent is benzenesulfonyl chloride $(C_6H_5SO_2Cl)$.It reacts with $1^o$ amines to form a sulfonamide that is soluble in alkali.It reacts with $2^o$ amines to form a sulfonamide that is insoluble in alkali.It does not react with $3^o$ amines.Therefore,it is used to distinguish and separate $1^o, 2^o$ and $3^o$ amines.Option $A$ is correct.Regarding volatility,the order is $3^o > 2^o > 1^o$ due to the extent of intermolecular hydrogen bonding,so option $C$ is incorrect.Liebermann nitroso test is used to distinguish $1^o, 2^o$ and $3^o$ amines,so option $D$ is incorrect.

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