Structural isomers differ in their bond linkage and geometric, or cis-trans isomers differ in their geometry. Optical isomers differ in their interaction with plane-polarized light.
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Though structural isomers have the same atoms, the atoms and bonds are arranged differently between isomers. Cis-trans isomers are prevalent in molecules' double bonds and have different configurations that affect a range of properties including polarity and the melting point.