Arrange the following in increasing order of their heat of hydrogenation $(- Δ H)$ .

I < I I < I I I < I V

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I V < I I I < I I < I

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I V < I I I < I < I I

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I < I I < I V < I I I

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Solution

The correct option is B $I < I I < I I I < I V$
Stability of alkene is inversely 'proportional to their' heat of. hydrogenation $(- Δ H)$ . $I$ is most stable as it Is tetra substituted as well as conjugated $I V$ has least substituted double bond.

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