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("1,1-dichlorethene")(underset(H-C-H)underset(||)(Cl-C-Cl))" "underset("cis-1,2-dichloroethene")(underset(H-C-Cl)underset(||)(H-C-Cl))" "underset("trans-1,2-dichloroethene")underset(Cl-C-H)underset(||)(H-C-Cl)`