Which of the following alkenes gives both cis | vedclass

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(D) Catalytic hydrogenation $(H_2/Ni)$ of alkenes involves the syn-addition of hydrogen across the double bond. $(a)$ $4-$methylmethylenecyclohexane o

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All of these

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(D) Catalytic hydrogenation $(H_2/Ni)$ of alkenes involves the syn-addition of hydrogen across the double bond. $(a)$ $4-$methylmethylenecyclohexane on hydrogenation yields both $cis-1,4-$dimethylcyclohexane and $trans-1,4-$dimethylcyclohexane due to the approach of $H_2$ from either face of the ring. $(b)$ $1,4-$dimethylcyclohex$-1-$ene similarly yields both $cis$ and $trans$ isomers of $1,4-$dimethylcyclohexane. $(c)$ $3,3,6-$trimethylcyclohex$-1-$ene also produces stereoisomeric products upon hydrogenation. Since all the given alkenes can produce $cis$ and $trans$ isomers (or diastereomers) upon catalytic hydrogenation, the correct answer is 'All of these'.

Which of the following alkenes gives both $cis$ and $trans$ isomers upon catalytic hydrogenation?

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