Resonance Energy MCQ - Practice Questions with Answers

Resonance Enthalpy: 

The theoretical difference in molecular energy between a resonance hybrid and the 'most stable' resonance contributor (if this resonance contributor existed as a real molecule). In other words, the stability gain by electron delocalization due to resonance versus the absence of such delocalization. The resonance energy of benzene is 36 kcal mol^-1 .

Calculation of Resonance Energy:

(1) Resonance energy can be calculated in terms of the heat of the formation data:

(2) Resonance energy can be calculated in terms of the heat of combustion data:

(3) Resonance energy can be calculated in terms of the heat of hydrogenation data:

Note: Resonance Energy is always a Positive Number. Use this fact to quickly calculate Resonance Energy using the above formulae.

The calculation of Resonance energy in terms of Heat of hydrogenation is given below: