Chirality in Molecules The cis isomer is achiral. The trans isomer is chiral. Enantiomers:nonsuperimposable mirror images,different molecules. => same compound different compounds H cis-1,2-dichlorocyclopentane trans-1,2-dichlorocyclopentane (achiral) (chiral) Copyright2005 Pearson Prentice Hall,Inc. 4Chapter 5 4 Chirality in Molecules • The cis isomer is achiral. • The trans isomer is chiral. • Enantiomers: nonsuperimposable mirror images, different molecules. =>