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

I I I > I I > I

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I I > I I I > I

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I I > I > I I I

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I > I I > I I I

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Solution

The correct option is A $I I I > I I > I$
Heat of Hydrogenation $\propto \frac{1}{N u m b e r o f h y d r o c o n j u g a b l e h y d r o g e n (H C H) a t o m s}$
(I) contains 9 HCH atoms,(II)contain 6 HCH atoms and (III) contain only 3 HCH atoms (III)>(II)>(I)
The order of enthalpy of hydrogenation is:
(III)>(II)>(I)

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