The primary amine shown is treated with benzenesulfonyl chloride, then with aqueous $NaOH$ . Which structure is the product that dissolves in the alkali?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: B

The amine shown is propylamine. It reacts with benzenesulfonyl chloride to give N-propylbenzenesulfonamide, which still has an acidic N-H (electron-withdrawing sulfonyl group) and dissolves in aqueous alkali as its sodium salt. The other structures have no N-H or no nitrogen.

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The primary amine shown is treated with benzenesulfonyl chloride, then with aqueous NaOH. Which structure is the product that dissolves in the alkali?

Answer: B

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The primary amine shown is treated with benzenesulfonyl chloride, then with aqueous $NaOH$ . Which structure is the product that dissolves in the alkali?