Which of the following structures is not meso | vedclass

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(A) $meso$ compound is an optically inactive molecule that contains chiral centers but has an internal plane of symmetry. For $2,3$-butanediol,the str

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(A) $meso$ compound is an optically inactive molecule that contains chiral centers but has an internal plane of symmetry. For $2,3$-butanediol,the structure is $CH_3-CH(OH)-CH(OH)-CH_3$. In a Fischer projection,a $meso$ form must have a plane of symmetry such that the top half is a mirror image of the bottom half. Analyzing the options,option $A$ shows a structure where the substituents do not allow for an internal plane of symmetry,making it not a $meso$ compound. Specifically,the arrangement of $H$ and $OH$ groups relative to the $CH_3$ groups in option $A$ prevents the molecule from being superimposable on its mirror image through an internal plane of symmetry.

Which of the following structures is not meso-$2,3$-butanediol?

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