Discuss the nature of C-X bond in the haloarenes.

Explanation

Due to higherr electronegativity of halogen (X) over carbon, the C-X bond in haloarenes is polar. Further, the lone pair of electrons on the X atom are delocalized over the benzener ring. As a result, C-X bond in haloarenes acquires some double bond character (for resonance structures of chlorobenzene). due to donation of the lone paiir of electrons on X towards the benzene ring and partial double bond character of the C-X bond, the C-X bond in haloarenes is less polar than in alkyl halides. this is supported by the observation that dipole moment of chlorobenzene (1.69D) is little lower than that of `CH_(3)Cl` (1.86D).