Q.

Select the set with correct order of resonance energies in the given pair of compounds.

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a

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b

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c

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d

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answer is A, B, C.

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Detailed Solution

Structures given in D are resonating structures of the same species.
Greater the resonance , then greater will be the stability of the carbocation, carbon free radical. The fact is that it has more number of resonance structure and hence the charge is uniformly distributed.Due to resonance all the resonance structures are identical in nature and hence they will produce the most stable ion. If sp3 carbon occupies between the conjugates system then resonance will stop and do not occur further, hence we can say that sp2 carbon favour

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