Which of the following is a meso compound?

Acis-1,2-Dimethylcyclopentane
Btrans-1,2-Dimethylcyclopentane
Ctrans-1,3-Dimethylcyclopentane
D1,1-Dimethylcyclopentane

Answer: A

A meso compound has stereocentres but is achiral through an internal mirror plane. cis-1,2-Dimethylcyclopentane has two stereocentres of opposite descriptor (R,S) and a mirror plane. The trans-1,2 and trans-1,3 isomers are chiral, and 1,1-dimethylcyclopentane has no stereocentre.

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