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Ozonolysis of Aromatics

When benzene ...

Question

When benzene undergoes hydrogenation in the presence of a catalyst, the energy that is released (the heat of hydrogenation) is:

A

same as for cyclohexatriene

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B

same as for 1, 3- cyclohexadiene

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C

same as for 1, 4- cyclohexadiene

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D

less than for cyclohexatriene

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Solution

The correct option is B less than for cyclohexatriene
Heat of hydrogenation of benzene is less than that of cyclohexatriene due to resonance energy of benzene.

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