# How do geometric isomers differ from structural isomers?

Consider $\text{but-2-ene}$. Now $\text{but-2-ene}$ has cis and trans isomers, and I assume you can identify them. In each isomer, $C 1$ connects to $C 2$, connects to $C 3$, connects to $C 4$. And thus the cis and trans isomers are structurally equivalent, because they have precisely the same connectivity. Nevertheless because $C 1$ can be on the opposite (or the same side) as $C 4$, this simple organic molecule can generate a pair of geometric isomers in their $\text{cis}$ and $\text{trans}$ varieties.