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(A) The reaction of cyclopropyl-ethene with $HBr$ initiates with the protonation of the double bond to form a cyclopropylmethyl carbocation. This carb

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(A) The reaction of cyclopropyl-ethene with $HBr$ initiates with the protonation of the double bond to form a cyclopropylmethyl carbocation. This carbocation is stabilized by $\sigma$-resonance (bent bonds of the cyclopropane ring). However,it can undergo ring expansion to relieve ring strain and form a more stable carbocation. The cyclopropylmethyl carbocation can rearrange to a cyclobutyl carbocation. The cyclobutyl carbocation is then attacked by the nucleophile $Br^-$ to form cyclobutyl bromide. Therefore,the pathway involving ring expansion to a cyclobutyl system is the most likely outcome.

Taking into account the stability of various carbocations and the rules governing mechanisms of carbocation rearrangements,which reaction is most likely to occur during the given reaction?

Similar Questions

The product of the rearrangement of the given oxyallyl cation is:

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