The heat of hydrogenation of one double bond | vedclass

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(D) The resonance energy is defined as the difference between the calculated heat of hydrogenation (assuming three isolated double bonds) and the expe

Vedclass · Accepted Answer

$35.8$

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(D) The resonance energy is defined as the difference between the calculated heat of hydrogenation (assuming three isolated double bonds) and the experimental heat of hydrogenation.Calculated heat of hydrogenation for benzene = $3 	imes 28.6 \, kcal \, mol^{-1} = 85.8 \, kcal \, mol^{-1}$.Experimental heat of hydrogenation for benzene = $50 \, kcal \, mol^{-1}$.Resonance energy = $85.8 - 50 = 35.8 \, kcal \, mol^{-1}$.

The heat of hydrogenation of one double bond in cyclohexene is $28.6 \, kcal \, mol^{-1}$ and the heat of hydrogenation of benzene to cyclohexane is $50 \, kcal \, mol^{-1}$. The resonance stabilization energy of benzene is ...... $kcal \, mol^{-1}$.

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