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(A) In the electrophilic addition of $HBr$ to but$-1-$ene,the proton $(H^+)$ attacks the double bond to form a carbocation intermediate.Carbocation $A

Vedclass · Accepted Answer

Carbocation $B$ is more stable and formed relatively at a faster rate.

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(A) In the electrophilic addition of $HBr$ to but$-1-$ene,the proton $(H^+)$ attacks the double bond to form a carbocation intermediate.Carbocation $A$ is a primary $(1^\circ)$ carbocation $(CH_3-CH_2-CH_2-CH_2^+)$,while carbocation $B$ is a secondary $(2^\circ)$ carbocation $(CH_3-CH_2-CH^+-CH_3)$.Secondary carbocations are more stable than primary carbocations due to the inductive effect and hyperconjugation.Because carbocation $B$ is more stable,its formation has a lower activation energy,meaning it is formed at a faster rate.

Choose the correct statement regarding the formation of carbocations $A$ and $B$ given:
$CH_3-CH_2-CH=CH_2 + HBr \to CH_3-CH_2-CH_2-CH_2^+ + Br^-$ $(A)$
$CH_3-CH_2-CH=CH_2 + HBr \to CH_3-CH_2-CH^+-CH_3 + Br^-$ $(B)$

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Choose the correct statement regarding the formation of carbocations $A$ and $B$ given:$CH_3-CH_2-CH=CH_2 + HBr \to CH_3-CH_2-CH_2-CH_2^+ + Br^-$ $(A)$$CH_3-CH_2-CH=CH_2 + HBr \to CH_3-CH_2-CH^+-CH_3 + Br^-$ $(B)$