Answer:
Aniline is of basic nature. In order
to remove non-basic impurities, it is treated with dil. \[HCl\] when aniline
forms non-volatile hydrochloride. The impurities can be removed by distillation
provided these are low boiling in nature. From the hydrochloride, aniline can
be regenerated by reacting with a base such as sodium hydroxide.
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