Please help I have no idea how to do this.

There are three different dichloroethylenes (molecular formulaC2H2Cl2), which we can designate X, Y, and Z.
Compound X has no dipole moment, but compound Z does.
Compounds X and Z each combine with hydrogen to give the same product:

C2H2Cl2 (X or Z) + H2 → ClCH2single bondCH2Cl.

What are the structures of X, Y, and Z? (Draw complete Lewis structures. Assign lone pairs, radical electrons, and atomic charges where appropriate.)

1 answer

We can't draw diagrams on this forum. You have three isomers of C2H2Cl2. They are given below and you can (should) draw the structures from this.
1,1-dichloroethylene
1,2-dichloroethylene (the cis form)
1,2-dichloroethylene (the trans form)

Draw all of th structures so you can see what they look like. The trans form is the one with no dipole moment. The 1,1 is the one with a dipole moment. The third one is the one that's left. Hope this helps.