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Question

Among these compounds, the order of heats of hydrogenation is:

A
I>II>III
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B
III>II>I
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C
II>I>III
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D
II>III>I
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Solution

The correct option is C II>I>III
Heat of Hydrogenation α 1Stabilityα 1No. of resonating structuresα number of pi bonds
In between (I) and (II), no. of reasonating structures of (I) is maximum i.e. 2.
Heat of hydrogenation of (I) is lower than (II).
(III) has only one π bond, so least heat of hydrogenation.
Order of heat of hydrogenation is (III)>(II)>(I)

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