Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Ans. (C) - compounds (A), (C) and (D) are meso.

Sol. (A) cis-1,2-Dimethylcyclohexane: two stereocentres with an internal plane of symmetry - meso. (B) trans-1,4-Dimethylcyclohexane: C₁ and C₄ are not stereocentres (the two ring paths at each are identical); the molecule is achiral but with no chiral centre, so it is not a meso compound. (C) cis-1,3-Dimethylcyclohexane: two stereocentres and a plane of symmetry - meso. (D) The 1,2,3-trichlorocyclopropane shown has a plane of symmetry through C₂ bisecting the C₁-C₃ bond - meso. Hence (A), (C) and (D).