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  4. Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ? (R = alkyl substituent)

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Q. Which one of the following alkenes will react faster with $H_2$ under catalytic hydrogenation conditions ?
($R =$ alkyl substituent)

AIPMTAIPMT 2005Hydrocarbons

Solution:

Stability of alkene
$\propto \frac{1}{\text { Heat of hydrogenation of alkene }}$
Greater the number of alkyl groups attached to the double bonded carbon atoms, more stable is the alkene. Hence, given alkene follow the following order of stability.

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