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Question

Arrange the following compounds in increasing order of heat evolved when one mole of each of them is hydrogenated using Pt-catalyst.

A
I < II < III < IV
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B
III < II < II < IV
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C
II < III < IV < I
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D
IV < I < II < III
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Solution

The correct option is C II < III < IV < 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 zero α hydrogen.
II has six α hydrogen and is in trans form.
III has six α hydrogen is in cis form.
IV has three α hydrogen is in cis form.
Between II and III, III (cis) is more reactive and less stable as compared to II(trans).
Stability order II>III>IV>I
Heat of hydrogenation order II<III<IV<I

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