Compounds having heat of hydrogenation lesser than that of cyclohexa-1, 4-diene i.e. [Hint resonance energy of benzene is 36 Kcal]

Heat of hydrogenation of ethene is x_(1) and that of benzene is x_(2) . Hence resonance energy of benezene is

Heat of hydrogenation of cyclohexene to cyclohexane is -28.6kcal // mole. The observed heat of hydrogenation of benezene to cyclohexane is -49.8 kcal // mole. The resonance energy of benzene is :

Enthalpy of hydrogenation of benzene is DeltaH_(1) and for cyclohexene is DeltaH_(2) . The resonance energy of benzene is

Heat of hydrogenation of ethene is x_(1) and that of benzene is x_(2) . Hence, resonance energy is:

Heat of hydronization of ethene is x_(1) and that of benzene is x_(2) . Hence, resonance energy is :

The enthalpy of hydrogenation of cyclohexene is -119.5kJ mol^(-1) . If resonance energy of benzene is -150.4kJ mol^(-1) , its enthalpy of hydrogenation would be :