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

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II > III > I

II > I > III

I > II > III

III > II > I

answer is D.

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Detailed Solution

Enthalpy of hydrogenation is inversely proportional to the stability of alkenes.

Stability of alkenes : I > II > III . ..I is resonance stabilised and is also aromatic , it has 9 hyperconjugated hydrogens ; II….resonce stabilized , 8 hyperconjugated hydrogens. ; III…..no resonance , 6 hyperconjugated hydrogens.

stability is inversely proportional to enthaly of hydrogenation

Enthalpy of hydrogenation : I < II < III

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