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(A) The enthalpy of hydrogenation is inversely proportional to the stability of the alkene.Stability of alkenes is determined by the number of $\alpha

Vedclass · Accepted Answer

$II > III > I$

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(A) The enthalpy of hydrogenation is inversely proportional to the stability of the alkene.Stability of alkenes is determined by the number of $\alpha$-hydrogens (hyperconjugation).Compound $I$ is a tetrasubstituted alkene with $8$ $\alpha$-hydrogens.Compound $III$ is a trisubstituted alkene with $5$ $\alpha$-hydrogens.Compound $II$ is a disubstituted alkene with $4$ $\alpha$-hydrogens.Since stability order is $I > III > II$,the enthalpy of hydrogenation order is $II > III > I$.

Given the enthalpy of hydrogenation of these compounds will be in the order:

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