Which of the following alkynes,upon treatment | vedclass

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(D) The hydrogenation of an alkyne with $2 \ mole$ of $H_2$ in the presence of $Pt$ catalyst results in the corresponding alkane.For a compound to be

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(D) The hydrogenation of an alkyne with $2 \ mole$ of $H_2$ in the presence of $Pt$ catalyst results in the corresponding alkane.For a compound to be optically active,it must contain a chiral center (a carbon atom bonded to four different groups).Let's analyze the products:$A$) $3-$Methyl-$1-$pentyne $(CH_3CH_2CH(CH_3)C \equiv CH)$ on hydrogenation gives $3-$methylpentane $(CH_3CH_2CH(CH_3)CH_2CH_3)$. This molecule has a chiral center at $C-3$ $(CH_3CH_2-CH(CH_3)-CH_2CH_3)$,so it is optically active.$B$) $4-$Methyl-$1-$hexyne $(CH_3CH_2CH(CH_3)CH_2C \equiv CH)$ on hydrogenation gives $3-$methylhexane $(CH_3CH_2CH(CH_3)CH_2CH_2CH_3)$. This molecule has a chiral center at $C-3$,so it is optically active.$C$) $3-$Methyl-$1-$heptyne $(CH_3CH_2CH_2CH_2CH(CH_3)C \equiv CH)$ on hydrogenation gives $3-$methylheptane $(CH_3CH_2CH_2CH_2CH(CH_3)CH_2CH_3)$. This molecule has a chiral center at $C-3$,so it is optically active.Since all the given options result in optically active alkanes,the correct answer is $D$.

Which of the following alkynes,upon treatment with $H_2$ $(2 \ mole)$ / $Pt$,gives an optically inactive compound?

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