Which of the following alkenes reacts fastest | vedclass

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(B) The rate of catalytic hydrogenation of alkenes is inversely proportional to the steric hindrance around the double bond.More substituted alkenes h

Vedclass · Accepted Answer

$A$ cis-disubstituted alkene $(R-CH=CH-R)$

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(B) The rate of catalytic hydrogenation of alkenes is inversely proportional to the steric hindrance around the double bond.More substituted alkenes have greater steric hindrance,which makes it difficult for the alkene to approach the metal catalyst surface.Therefore,the order of reactivity is: monosubstituted > disubstituted > trisubstituted > tetrasubstituted.Among the given options,the cis-disubstituted alkene $(R-CH=CH-R)$ is generally more reactive than the trans-disubstituted alkene due to less steric crowding on one side,but in terms of general substitution,the least substituted alkene is the fastest. Comparing the options provided,the disubstituted alkenes are more reactive than tri- and tetra-substituted ones. Between cis and trans,the cis-isomer is often more reactive in hydrogenation due to the accessibility of the double bond.

Which of the following alkenes reacts fastest with $H_2$ under catalytic hydrogenation conditions?

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