The enthalpy of hydrogenation of cyclohexene is -119.5 ~kJ ~mol ⁻¹ . If resoance energy of benzene is -150 kJ mol ⁻¹ , its enthalpy of hydrogenation would be:

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Correct answer: C. -208.1 ~kJ ~mol ⁻¹

Heat of hydrogenation of cyclohaxene =-119.5 ~kJ / mol Heat of hydrogenation of benzene =3 -119.5=-358.5 ~kJ / mol Resonance energy = Observed H - Calculated H =-150.4=-358.5-xx=-208.1 ~kJ Related Theory The energy calculated for a resonance hybrid is lower than the energies of any of the alternative structures; the molecule is then said to be stabilized by resonance.

The enthalpy of hydrogenation of cyclohexene is -119.5 ~kJ ~mol ⁻¹ . If resoance energy of benzene is -150 kJ mol ⁻¹ , its enthalpy of hydrogenation would be:

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