Part a : 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 a : 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

(a) is the cyclopentadienyl cation : 4π, planar, anti-aromatic, so it is destabilised. (b) is the allyl cation, which is stabilised by ordinary resonance. So a < b.

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