Question

What are the three possible Lewis structures for `C_2H_2Cl_2`?

Answer 1

Here's what I get.

Explanation:

The first isomer has two chlorine atoms on the same carbon,

The π-bond in alkenes prevents rotation about the `"C-C"` axis.

Thus, thee are two isomers with the chlorine atoms on different carbons:

• one has the two chlorine atoms on the same side of the double bond
• the other has the two chlorine atoms on opposite sides of the double bond