How to determine if the ring compound has optical isomers?

The first column and fourth column of the table below says that the compound has the plane of symmetry and is not optically active. However, I noticed that each side has different arrangement of the H and Cl atoms. Does it still count as being symmetrical? [![enter image description here](https://i.stack.imgur.com/UHeAD.jpg)](https://i.stack.imgur.com/UHeAD.jpg)


