Question

when resonance energy increases then resonance stability ???
what happens to it increases or decreases

Answer 1

Answer:

Greater the resonance energy, more will be the stability of the compound.

Reason- The resonance energy is greater when

The contributing structures are all equivalent.

The number of contributing structures of roughly comparable energy is greater.

Example- cyclohexene containing 1 double bond has a heat of hydrogenation of 28.6 kcal.mol^-1

We might expect cyclohexatriene to have a heat of hydrogenation of about three times as large as cyclohexene.

Actually the value of benzene (1,3,5-cyclohexatriene) is 49 kcal.mol^-1

It is 36 k cal.mol^-1 less than expected value.

So, benzene evolves 36 k Cal less energy per mole than predicted. This means benzene is more stable than hypothetical cyclohexatriene by 36 k cal.mol^1 energy.

This 36 k cal.mol^-1 energy is resonance energy of benzene.

Explanation:

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