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The correct increasing order of heat evolved when 1.0 mole of each of the following is hydrogenated completely is
III) $C H_{2} = C = C H - C H_{2} C H_{3}$
IV) $C H_{2} = C H = C = C H - C H_{3}$

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$I I < I < I V < I I I$

$I < I I < I I I < I V$

$I < I I < I V < I I I$

$I I I < I V < I < I I$

answer is D.

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Detailed Solution

conjugated diene is more stable hence requires more energy to undergo hydrogenation, hence will liberate least energy in hydration,

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