Which of the following is optically active?

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(B) molecule is optically active if it lacks a plane of symmetry,center of inversion,or improper axis of rotation (i.e.,it is chiral).$A$: The structu

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(B) molecule is optically active if it lacks a plane of symmetry,center of inversion,or improper axis of rotation (i.e.,it is chiral).$A$: The structure is $2,3$-butanediol in a Fischer projection. It has a plane of symmetry passing through the center,making it a meso compound (optically inactive).$B$: The structure is $2$-chlorobutane. The central carbon is bonded to four different groups $(-H, -Cl, -CH_3, -CH_2CH_3)$,making it a chiral center. It lacks any plane of symmetry and is therefore optically active.$C$: The structure is $trans$-$1,2$-cyclopentanediol. It has a $C_2$ axis of symmetry but no plane of symmetry or center of inversion,making it chiral and optically active. However,looking at the provided image,it represents $trans$-$1,2$-cyclopentanediol,which is chiral.$D$: The structure is $cis$-$1,3$-dimethylcyclopentane. It has a plane of symmetry passing through the $C_2$ carbon,making it a meso compound (optically inactive).Comparing the options,$B$ is a classic example of a chiral molecule with a single stereocenter.

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