Which of the following is not optically activ | vedclass

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(D) molecule is optically inactive if it possesses a plane of symmetry or a center of symmetry,making it achiral.$1$. Option $A$ (trans-$1,2$-dimethyl

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(D) molecule is optically inactive if it possesses a plane of symmetry or a center of symmetry,making it achiral.$1$. Option $A$ (trans-$1,2$-dimethylcyclopropane): This molecule has a $C_2$ axis of symmetry but lacks a plane of symmetry,making it chiral and optically active.$2$. Option $B$ (cis-$1,2$-dimethylcyclopropane): This molecule has a plane of symmetry passing through the $CH_2$ group and bisecting the $C-C$ bond,making it achiral and optically inactive.$3$. Option $C$ ($1,1$-dimethylcyclopropane): This molecule has a plane of symmetry,making it achiral and optically inactive.$4$. Option $D$ (meso-tartaric acid): This molecule has an internal plane of symmetry,making it achiral and optically inactive.Given the standard nature of such questions,usually,the most prominent example of an optically inactive compound due to an internal plane of symmetry is the meso compound. However,both $B$,$C$,and $D$ are optically inactive. In the context of typical multiple-choice questions where only one answer is expected,$D$ (meso-tartaric acid) is the classic textbook example of an optically inactive compound due to an internal plane of symmetry.

Which of the following is not optically active?

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