Which of the following choice is the correct order of resonance energy of these molecules:

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III>I>II

II>I>III

I>II>III

III>II>I

answer is A.

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Detailed Solution

Resonance energy is theenergy difference between the real resonance
hybrid structure and the most stable (the lowest energy) resonance structure. The more the number of important contributing structures, the more is the resonance energy and more is the stability. We can see in option one two benzene ring are present and combined in option 2.

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