Q.What are the uses of Chlorobenzene ?

Uses of Haloarenes

Haloarenes are aromatic compounds in which a halogen atom is bonded directly to a carbon of the benzene ring, chlorobenzene ($C_6H_5Cl$) being the most important. Because the C–X bond has partial double-bond character (resonance of the halogen lone pair into the ring) it is stronger and less reactive than in haloalkanes, which makes haloarenes stable, useful industrial intermediates rather than easily displaced reactants.

Key uses:

• Solvents: chlorobenzene and dichlorobenzenes are good non-polar solvents for degreasing and for dissolving resins and rubbers.
• Precursor to phenol: in the Dow process, chlorobenzene is heated with aqueous $NaOH$ at ~623 K and 300 atm to give phenol.

• Precursor to aniline: nitration then reduction, or direct amination, leads to aniline, a dye and drug intermediate.
• DDT synthesis: chlorobenzene condenses with chloral ($CCl_3CHO$) to give the insecticide DDT. …