Part k : Compare the resonance energy of the following compounds. Is the resonance energy of (a) greater than, less than or equal to (b) ?
(a)
(b)

Question

Part k : Compare the resonance energy of the following compounds. Is the resonance energy of (a) greater than, less than or equal to (b) ? (a) (b)

TestHub · Accepted Answer

In (a) the C=O group is in linear conjugation with the diene (O=C-C=C-C=C). In (b) the two C=C bonds are cross-conjugated through the C=O, which gives less delocalisation. So a > b.

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