Explain why the energy of activation for products 1 and 2 to revert back to ally

Question

Explain why the energy of activation for products 1 and 2 to revert back to allylic carbocation A is much less than the Eact for 2-bromobutane to revert to the sec-butyl carbocation (the Markovnikov addition product from reaction of HBr with 1-butene). Hint: How do the carbocations formed in each case compare in stability?)

Explanation / Answer

order of stability of carbocations are benzylic = allylic > tertiary > secondary > primary as we see , allylic carbocation is more stable due to resonance compared to secondary carbocation. Hence activation energy is less in case of allylic carbocation case compared to other one.

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