The dipole moment of m-dichlorobenzene is 1.5D, the value of dipole moment of o-dichlorobenzene is a.  0.0D                                 b. 1.5 D                                 c. 2.6D                   d. 2.12D

The dipole moment of m-chlorobenzene is 1.5 D. Then o-dichlorobenzene will have chlorine attached to 1st and 2nd carbon atom .As dipole moments are vectors, we use vector sum. The angle between the two vectors is 60 degree there fore we get 2.6 D and the answer