Stereoisomers Geometric isomers:cis-trans isomers. Enantiomers:nonsuperimposable mirror images,different molecules. => cis-1,2-dichlorocyclopentane trans-1,2-dichlorocyclopentane Chapter 5 3 Chapter 5 3 Stereoisomers • Geometric isomers: cis-trans isomers. • Enantiomers: nonsuperimposable mirror images, different molecules. => cis-1,2-dichlorocyclopentane trans -1,2-dichlorocyclopentane H Cl H Cl H Cl H Cl H Cl Cl H H Cl Cl H