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(C) The given compound is $1$-ethylidene-$3$-ethylcyclopent-$1$-ene. Upon catalytic hydrogenation with $Pd/C$ and excess $H_2$,both double bonds are r

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$3$

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(C) The given compound is $1$-ethylidene-$3$-ethylcyclopent-$1$-ene. Upon catalytic hydrogenation with $Pd/C$ and excess $H_2$,both double bonds are reduced to single bonds. The product formed is $1,3$-diethylcyclopentane. This molecule has two chiral centers at positions $1$ and $3$. Since the molecule is a substituted cyclopentane,we can have $cis$ and $trans$ isomers. The $cis$-$1,3$-diethylcyclopentane has a plane of symmetry,making it a $meso$ compound (achiral). The $trans$-$1,3$-diethylcyclopentane exists as a pair of enantiomers (chiral). Thus,there are $3$ stereoisomers in total: one $meso$ form and one pair of enantiomers.

If the following compound is treated with $Pd/C$ in excess of hydrogen gas,how many stereoisomers of the product will be obtained?

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