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(C) To possess a centre of symmetry $(COS)$,the molecule must have an inversion point such that every atom has an identical atom at an equal distance

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$1,3-$dimethylcyclobutane (trans-isomer)

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(C) To possess a centre of symmetry $(COS)$,the molecule must have an inversion point such that every atom has an identical atom at an equal distance in the opposite direction. $1$. $1,2$-dichlorocyclobutane $(cis)$: Has a plane of symmetry but no centre of symmetry. $2$. $1,3$-dichlorocyclobutane $(cis)$: Has two planes of symmetry but no centre of symmetry. $3$. $1,3$-dimethylcyclobutane $(trans)$: Has a plane of symmetry and a centre of symmetry. $4$. $1,3$-dimethylcyclobutane $(cis)$: Has two planes of symmetry but no centre of symmetry. Thus,the $trans-1,3$-dimethylcyclobutane isomer possesses both $POS$ and $COS$.

Which of the following compounds possesses both a plane of symmetry $(POS)$ and a centre of symmetry $(COS)$?

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