Which of the following are meso compounds?

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Question

(D) meso compound is an achiral molecule that contains chiral centers but has an internal plane of symmetry or center of inversion,making it optically

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$A, B, D$

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(D) meso compound is an achiral molecule that contains chiral centers but has an internal plane of symmetry or center of inversion,making it optically inactive.$A$: $cis-1,3-dimethylcyclopentane$ has a plane of symmetry passing through the $C-2$ atom,making it a meso compound.$B$: $2,3-dibromobutane$ (in the given Fischer projection) has a plane of symmetry passing between the two chiral carbons,making it a meso compound.$C$: $5,5-dibromocyclohexa-1,3-diene$ is achiral because it does not have any chiral centers (the carbon with two $Br$ atoms is not chiral).$D$: $2,3,4-tribromopentane$ (with the given stereochemistry) has a plane of symmetry passing through the central $C-3$ atom,making it a meso compound.Therefore,$A, B,$ and $D$ are meso compounds.

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