Which of the following compounds is chiral?

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(B) molecule is chiral if it lacks a plane of symmetry or a center of inversion,meaning it is not superimposable on its mirror image. $A$: $2,3$-dichl

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(B) molecule is chiral if it lacks a plane of symmetry or a center of inversion,meaning it is not superimposable on its mirror image. $A$: $2,3$-dichlorobutane (meso form) has a plane of symmetry and is achiral. $B$: $2$-bromo-$3$-chlorobutane has two chiral centers ($C2$ and $C3$). Since the substituents on the two chiral carbons are different ($-Br$ vs $-Cl$),there is no internal plane of symmetry,making it a chiral molecule. $C$: $2$-bromo-$3$-chloro-$2,3$-dimethylbutane has two chiral centers,but it is also chiral. However,$B$ is the standard example of a simple chiral alkane derivative with two distinct chiral centers. $D$: $2,3$-dichloro-$2,3$-dimethylbutane has a plane of symmetry and is achiral. Therefore,option $B$ is the correct answer.

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