Which of the following are meso compounds?

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(D) meso compound is an optically inactive molecule that contains stereocenters but has an internal plane of symmetry or a center of inversion.$I$: Th

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$II$ and $III$

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(D) meso compound is an optically inactive molecule that contains stereocenters but has an internal plane of symmetry or a center of inversion.$I$: This structure has two chiral centers,but it lacks a plane of symmetry because the top group is $Me$ (methyl) and the bottom group is $Et$ (ethyl). Thus,it is not a meso compound.$II$: This is $2,3$-dichlorobutane. It has a plane of symmetry passing through the center of the molecule,making it a meso compound.$III$: This is $cis-1,3$-dimethylcyclohexane. It has a plane of symmetry passing through the $C2$ and $C5$ carbons,making it a meso compound.Therefore,both $II$ and $III$ are meso compounds.

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