Question

the dipole moment of nitrobenzene = 3.95D is higher than Nitromethane(3.60D) although both have same polar group.Explain?

Answer 1

Answer:

Nitrobenzene has more dipole moment than nitro methane because in nitrobenzene there is greater charge separation due to the resonance.

As we know, dipole moment is directly proportional to the charge and distance

. D = d x e

where d = distance of separation

and e = charge. In nitro methane

there is no such kind of charge separation. Therefore, it has less dipole moment.