Answer:
Due
to higher 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 benzene ring. As a result, C-X bond in haloarenes acquires
some double bond character (for resonance structures of chlorobenzene, refer to
page 10/41). Due to donation of the lone pair 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 alkyi halides. This is supported by the
observation that dipole moment of chlorobenzene (1 -69 D) is little lower than
that of 
(1-83 D).
You need to login to perform this action.
You will be redirected in
3 sec
