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Resonance Effect

For the given...

Question

For the given compounds the correct order of resonance energy is:

A

I I I > I > I I

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B

I I > I > I I I

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C

I > I I > I I I

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D

I I I > I I > I

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Solution

The correct option is C $I > I I > I I I$
More the number of contributing resonating structures, more will be the resonance energy.

Therefore, the order of resonance energy of the given compounds is:
$I > I I > I I I$

Theory:
The difference in energy between the actual structure (resonance hybrid) and the lowest energy (most stable) resonance structure of a molecule is called resonance enrgy.

If the most stable resonance structure has the energy $E_{C}$ and the energy of resonance hybrid is $E_{O}$ then
Resonance Energy, $E_{R} = E_{O} - E_{C}$

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Resonance Effect

Standard XII Chemistry

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