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Question

Which one has the highest heat of hydrogenation?
III
III



A
I
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B
II
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C
III
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D
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 hydrogenationnumber of π bond
Heat of hydrogenation1stability of alkene1number 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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