Among the following,the Newman projections of | vedclass

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(A) meso compound is optically inactive due to the presence of a plane of symmetry or center of inversion. For $2,3$-butanediol,the meso form has a pl

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$P, Q$

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(A) meso compound is optically inactive due to the presence of a plane of symmetry or center of inversion. For $2,3$-butanediol,the meso form has a plane of symmetry in its eclipsed conformation. By analyzing the given Newman projections: In structure $P$,the groups are arranged such that there is a plane of symmetry passing through the molecule,making it the meso form. In structure $Q$,the arrangement also allows for a plane of symmetry,representing another conformation of the meso form. Structures $R$ and $S$ do not possess the required symmetry for the meso form of $2,3$-butanediol. Therefore,$P$ and $Q$ are the Newman projections of meso-$2,3$-butanediol.

Among the following,the Newman projections of meso-$2,3$-butanediol are

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