Question
A compound $Z$ with molecular formula $\ce{C_3H_9N}$ reacts with $\ce{C_6H_5SO_2Cl}$ to give a solid, insoluble in alkali. Identify $Z.$

Answer

Compound $'Z\ '$ with molecular formula $\ce{C_3H_9N}$ is an aliphatic amine which on treatment with $\ce{C_6H_5SO_2Cl}$ gives a solid, insoluble in alkali.
Therefore, the product does not have any replaceable hydrogen on the nitrogen atom. In other words, the amines $(Z)$ must be secondary amine, i.e., $Z$ is ethyl methylamine $\ce{(C_2H_5NHCH_3)}.$

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