## Organic Chemistry (8th Edition)

These are constitutional isomers. Constitutional isomers have same molecular formulas, but different connectivity of atoms. The given compounds have same molecular formula $C_2H_2Br_2$, but different connectivity. The compound on the left has a H and Br on the carbon, whereas the compound on the right has two Br on one carbon. Moreover, they cannot be cis-trans isomers because the compound on the right has two same groups on the carbon.