Which reaction will occur at the fastest rate | vedclass

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(D) The reaction of alkenes with $HBr$ proceeds via the formation of a carbocation intermediate. The rate of the reaction is directly proportional to

Vedclass · Accepted Answer

$2-$methyl$-1-$butene + $HBr$ $\rightarrow$ $2-$bromo$-2-$methylbutane

Vedclass · Answer

(D) The reaction of alkenes with $HBr$ proceeds via the formation of a carbocation intermediate. The rate of the reaction is directly proportional to the stability of the carbocation formed in the rate-determining step.$(A)$ Forms a secondary $(2^{\circ})$ carbocation.$(B)$ Forms a primary $(1^{\circ})$ carbocation.$(C)$ Forms an allylic carbocation (stabilized by resonance).$(D)$ Forms a tertiary $(3^{\circ})$ carbocation.Since a tertiary $(3^{\circ})$ carbocation is more stable than a secondary $(2^{\circ})$,primary $(1^{\circ})$,or even an allylic carbocation in this specific context of alkyl substitution,the reaction in option $(D)$ proceeds at the fastest rate.

Which reaction will occur at the fastest rate?

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