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(D) The heat of hydrogenation is inversely proportional to the stability of the alkene.Stability order of the given alkenes based on hyperconjugation

Vedclass · Accepted Answer

$1 > 4 > 3 > 2$

Vedclass · Answer

(D) The heat of hydrogenation is inversely proportional to the stability of the alkene.Stability order of the given alkenes based on hyperconjugation and steric hindrance is:$2$ (trisubstituted) $> 3$ (trans-disubstituted) $> 4$ (cis-disubstituted) $> 1$ (monosubstituted).Therefore,the order of decreasing heat of hydrogenation is the reverse of the stability order:$1 > 4 > 3 > 2$.Thus,the correct option is $(d)$.

Rank the following alkenes in order of decreasing heats of hydrogenation (largest first):
$1$. $1-$butene
$2$. $2-$methyl$-2-$butene
$3$. trans$-2-$butene
$4$. cis$-2-$butene

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Rank the following alkenes in order of decreasing heats of hydrogenation (largest first):$1$. $1-$butene$2$. $2-$methyl$-2-$butene$3$. trans$-2-$butene$4$. cis$-2-$butene