Which of the following is a meso compound?

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(D) meso compound is a molecule that contains chiral centers but is achiral due to the presence of an internal plane of symmetry $(P.O.S.)$ or center

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All of these

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(D) meso compound is a molecule that contains chiral centers but is achiral due to the presence of an internal plane of symmetry $(P.O.S.)$ or center of inversion $(C.O.I.)$.$1$. The structure in option $(A)$ is $2,3$-dibromobutane in its eclipsed form,which has a plane of symmetry passing through the $C2-C3$ bond,making it a meso compound.$2$. The structure in option $(B)$ is $3,4$-hexanediol,which also possesses a plane of symmetry,making it a meso compound.$3$. The structure in option $(C)$ is $cis$-$1,2$-cyclopropanediol,which has a plane of symmetry passing through the $C1-C2$ bond,making it a meso compound.Since all the given structures possess a plane of symmetry and chiral centers,they are all meso compounds.Therefore,the correct option is $(D)$.

Column-$I$	Column-$II$
$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)$$2$-butanol,$(-)$$2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

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