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7.8 Cl OH a) 4 b) * 4 * * * * * c) 16 d) None * * 7.9 The meso stereoisomer does not rotate plane polarized light because it has a plane of symmetry. The other two stereoisomers do rotate plane polarized light. CH₃ CH₃ CH₃ H Cl H C Cl C H C C C C H Cl Cl H H CH₃ CH₃ CH₃ Meso Rotates Rotates 7.10 The cis-diastereomer of 1,2-dimethylcyclopropane is meso and does not rotate plane polarized light because it has a plane of symmetry bisecting the ring. The trans-isomer exists as a pair of enantiomers that do rotate plane polarized light. Plane of symmetry Cl Cl Cl Meso Rotates Rotates 7.11 a) Yes b) No, meso c) Yes d) No, no chirality center 100