Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Write each stereoisomer as an up/down pattern of the six methyl groups on the ring. Nine configurations are distinct: (1) all-cis; (2) 1-trans; (3) 1,2-trans; (4) 1,3-trans; (5) 1,4-trans; (6) 1,2,3-trans; (7) 1,2,4-trans; (8) 1,3,5-trans; (9) 1,2,4,5-tetra-trans. Seven of the nine have an internal plane of symmetry (achiral); the remaining pattern is chiral and exists as a pair of enantiomers, so the nine configurations make 9 stereoisomers in all. So there are 7 meso (optically inactive) structures, 2 enantiomers (one pair), and 8 diastereomeric relations for any one isomer.

Ans. (C) 7 meso, 2 enantiomer, 8 diastereomers.