Question

what is the type of isomerism shown by dichloro dichlorobenzene?

Answer 1

Three isomers of dichlorobenzene occurs which are as : 1,2-dichlorobenzene , 1,3-dichlorobenzene and 1,4-dichlorobenzene. There structure are as below :

Now 1.4-dichlorobenzene as zero dipole moment because the bond moment cancels here resulting in zero dipole moment.