Ncert Exercises & Solutions

76 Discuss the nature of C—X bond in the haloarenes.

In haloarenes, carbon of benzene is bonded to halogen. Electronegativity of halogen is

more than that of sp? hybridised carbon of benzene ring. So, C— X bond Is a polar bond

Apart from this, lone pair of electrons of halogen atom are involved in resonance with

benzene ring. So, this C— X bond has acquire partial bond character.

This C— X bond of haloarenes is less polar than C— X bond of haloalkanes, This is

supported by the fact that dipole moment of chlorobenzene ( $μ$ = 1.69 D) Is litle lower than

that of CH $_{3}$ Cl ( $μ$ = 1.83 D)