The order of heat of hydrogenation in following compound is:

I < I I < I V < I I I

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I I I < I V < I I < I

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I I < I I I < I < I V

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I I < I V < I < I I I

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Solution

The correct option is A $I I I < I V < I I < I$
The heat of hydrogenation is proportional to the number of $α - h y d r o g e n$ and stability of alkene. $I I I$ is more stable as it contains more hyper conjugation and resonance stabilized. Then $I V$ is stable due to resonance and less hyperconjugation than first. In I and II, $α - h y d r o g e n$ is more in II than first, therefore, $I I$ is more stable than first. Therefore the order is $I I I < I V < I I < I$ .

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