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Dinesh khalmaniya 1 Best Answer
option A. only A is chiral so enantiopure/ optically active. in case of B 1,2-Dimethylcyclohexane possesses two diastereomers, one cis and one trans form. The trans form is chiral, but the cis form is achiral. Therefore, the cis form is considered a meso-compound. C and D possess plane of symmetry so optically inactive