How many alkenes on catalytic hydrogenation g | vedclass

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Question

(B) Isopentane is $2$-methylbutane,which has the molecular formula $C_5H_{12}$.Catalytic hydrogenation of an alkene adds $H_2$ across the double bond,

Vedclass · Accepted Answer

$3$

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(B) Isopentane is $2$-methylbutane,which has the molecular formula $C_5H_{12}$.Catalytic hydrogenation of an alkene adds $H_2$ across the double bond,so the starting alkene must have the molecular formula $C_5H_{10}$.The isomers of $C_5H_{10}$ that yield $2$-methylbutane upon hydrogenation are:$1$. $3$-methylbut-$1$-ene: $(CH_3)_2CH-CH=CH_2 + H_2 \xrightarrow{Pt} (CH_3)_2CH-CH_2-CH_3$$2$. $2$-methylbut-$2$-ene: $(CH_3)_2C=CH-CH_3 + H_2 \xrightarrow{Pt} (CH_3)_2CH-CH_2-CH_3$$3$. $2$-methylbut-$1$-ene: $CH_2=C(CH_3)-CH_2-CH_3 + H_2 \xrightarrow{Pt} CH_3-CH(CH_3)-CH_2-CH_3$Thus,there are $3$ such alkenes.

How many alkenes on catalytic hydrogenation give isopentane as a product?

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