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)

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 $C_6{H}_{5}N{H}_2\stackrel{dil.HCl}{\to }\underset{\begin{array}{c}Anilinehydrochloride\\ (black)\end{array}}{C_6{H}_{5}N{H}_2\cdot HCl\downarrow }$