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(B) The catalytic hydrogenation of an alkene using $H_2/Pt$ is a syn-addition reaction.For the product to be a meso compound,the starting alkene must

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cis$-3,5-$dimethylcyclohex$-1-$ene

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(B) The catalytic hydrogenation of an alkene using $H_2/Pt$ is a syn-addition reaction.For the product to be a meso compound,the starting alkene must be capable of forming a molecule with a plane of symmetry upon the addition of two hydrogen atoms to the same side of the double bond.Among the given options,cis$-3,5-$dimethylcyclohex$-1-$ene is optically active due to the absence of a plane of symmetry in the alkene.Upon catalytic hydrogenation,the two hydrogen atoms add to the same face of the double bond,resulting in cis$-1,3-$dimethylcyclohexane,which possesses a plane of symmetry $(POS)$ and is therefore a meso compound.Thus,the correct structure is cis$-3,5-$dimethylcyclohex$-1-$ene.

An optically active compound $A$ with molecular formula $C_8H_{14}$ undergoes catalytic hydrogenation to give a meso compound. The structure of $(A)$ is:

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