Which of the following compounds has the highest resonance energy?
A
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B
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C
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D
All have the same resonance energy.
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Solution
The correct option is A 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.
More the number of contributing resonating structures, more will be the resonance energy.
Therefore, option (a) has the highest resonance energy.