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NEET 2006 Chemistry question

ChemistryOrganic Oxidation & Reduction ReactionsNEET 2006

The enthalpy of hydrogenation of cyclohexene is . If resonance energy of benzene is , its enthalpy of hydrogenation would be:-

Answer: (2)

Solution

Hypothetical "cyclohexatriene" (three isolated C=C bonds) would have . Benzene is stabilised by resonance energy of 150.4 kJ mol (it is more stable by that amount), so its actual enthalpy

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Question ID VK-089609