For the given compounds the correct order of resonance energy is:
A
III>I>II
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B
II>I>III
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C
I>II>III
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D
III>II>I
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Solution
The correct option is CI>II>III 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>II>III
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 EC and the energy of resonance hybrid is EO then
Resonance Energy, ER=EO−EC