The enthalpy of hydrogenation of benzene is D | vedclass

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(A) The enthalpy of hydrogenation of cyclohexene is $\Delta H_2$. Since benzene has three double bonds,the expected enthalpy of hydrogenation for a hy

Vedclass · Accepted Answer

$3\Delta H_2 - \Delta H_1$

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(A) The enthalpy of hydrogenation of cyclohexene is $\Delta H_2$. Since benzene has three double bonds,the expected enthalpy of hydrogenation for a hypothetical $1,3,5-$cyclohexatriene (without resonance) would be $3 	imes \Delta H_2$. The actual enthalpy of hydrogenation of benzene is given as $\Delta H_1$. Resonance energy is defined as the difference between the expected enthalpy of hydrogenation and the actual enthalpy of hydrogenation: $	ext{Resonance Energy} = 	ext{Expected } \Delta H - 	ext{Actual } \Delta H$ $	ext{Resonance Energy} = 3\Delta H_2 - \Delta H_1$.

The enthalpy of hydrogenation of benzene is $\Delta H_1$ and for cyclohexene is $\Delta H_2$. Then the resonance energy of benzene is:

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