Write the structure of all the isomers of dichloroethene. Which one of them will have zero dipole-moment?

Explanation

There are three isomers of dichloroethene.
`underset("ethene")underset("1,1-dichloro")underset(H-C-H)overset(Cl-C-Cl)(||)" "underset("ethene")underset("cis-1,2- dichloro")underset(H-C-Cl)overset(H-C-Cl)(||)" "underset("ethene")underset("trans-1,2-dichloro")underset(Cl-C-H)overset(H-C-Cl)(||)`
Trans-1,2-dichloroethene has zero dipole-moment.