Which dimethylcyclobutane is optically active | vedclass

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Question

(A) molecule is optically active if it lacks a plane of symmetry or a center of inversion.$1.$ $cis-1, 2$-dimethylcyclobutane has a plane of symmetry,

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$trans-1, 2$-dimethylcyclobutane

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(A) molecule is optically active if it lacks a plane of symmetry or a center of inversion.$1.$ $cis-1, 2$-dimethylcyclobutane has a plane of symmetry,so it is optically inactive (meso).$2.$ $trans-1, 2$-dimethylcyclobutane exists as a pair of enantiomers and lacks a plane of symmetry,making it optically active.$3.$ $cis-1, 3$-dimethylcyclobutane has a plane of symmetry,so it is optically inactive.$4.$ $trans-1, 3$-dimethylcyclobutane has a plane of symmetry,so it is optically inactive.Therefore,$trans-1, 2$-dimethylcyclobutane is the optically active isomer.

Which dimethylcyclobutane is optically active?

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