# Out of the following compounds , which will be have a zero dipole moment.

(a) 1,1 - dichloroethylene (b) cis-1,2-dichlorethylene c)trans-1,2-dichlorethylene d) none of these.

In case of trans-1,2-dichloroethylene
The net dipole moment is zero but in case of cis -1,2 -dicholorethylene.
There is some resultant dipole moment.
Hence c is the correct answer.