Which one has the highest heat of hydrogenation?
III
III

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III

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None of the above

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Solution

The correct option is A I
More substituted alkenes are more stable and evolve less heat on hydrogenation.
Also, $Heat of hydrogenation \propto number of π bond$
$Heat of hydrogenation \propto \frac{1}{stability of alkene} \propto \frac{1}{number of α hydrogen}$
I has one $α$ hydrogen
II has nine $α$ hydrogen
III has 11 $α$ hydrogen

Stability order III>II>I
Heat of hydrogenation order I>II>III
Hence, I has highest heat of hydrogenation.

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