JEE Main Chemistry question

The heat of hydrogenation of benzene (to cyclohexane) is considerably less (less exothermic) than three times the heat of hydrogenation of cyclohexene. This difference is a direct measure of

(A)Benzene's ring strain
(B)Benzene's resonance (delocalisation) stabilisation energyCorrect
(C)The heat of combustion of benzene
(D)The heat of formation of cyclohexane

Answer: (B)

Solution

If benzene behaved as a simple (hypothetical) cyclohexatriene with three isolated double bonds, its hydrogenation would release about three times the heat of hydrogenation of one cyclohexene double bond. The experimentally much

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Question ID VK-142422