1,2-dichlorocyclopentane has two chiral carbons, which means there can be a maximum of 2^n stereoisomers, where n is the number of chiral centers. In this case, n=2, so there can be a maximum of 2^2 = 4 stereoisomers. However, one of these stereoisomers is a meso compound, which means it has an internal plane of symmetry and is optically inactive. Therefore, there are actually only 3 unique stereoisomers for 1,2-dichlorocyclopentane.Here are the structures for each stereoisomer:1. 1R,2R -1,2-dichlorocyclopentane H Cl \ / C1---C2 / \ H Cl2. 1S,2S -1,2-dichlorocyclopentane Cl H \ / C1---C2 / \ Cl H3. Meso-1,2-dichlorocyclopentane 1R,2S or 1S,2R H Cl \ / C1---C2 / \ Cl HIn these structures, C1 and C2 are the chiral centers, and the stereochemistry is indicated by the R and S configurations. The meso compound is the third structure, where the compound has an internal plane of symmetry and is optically inactive.