Question

A mixture of benzene and aniline can be separated by:

• A. hot water
• B. dil. HCl
• C. dil. NaOH
• D. alcohol

Answer 1

Answer: (B)

dil. HCl

Answer 2

Aniline is a weak base and added to dil. HCl to form aniline hydrochloride (black precipitate) While benzene does not react with dil. HCl. Thus these can be separated by using dil. HCl ${{C}_{6}}{{H}_{5}}N{{H}_{2}}\xrightarrow{dil.\,HCl}\underset{\begin{smallmatrix} Aniline\,\,hydrochloride \\\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(black) \end{smallmatrix}}{\mathop{{{C}_{6}}{{H}_{5}}N{{H}_{2}}\cdot HCl\downarrow }}\,$