Which of the following will react with a halo | vedclass

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(A) The reaction of alkenes with halogen acids $(HX)$ proceeds via an electrophilic addition mechanism,where the rate-determining step is the formatio

Vedclass · Accepted Answer

$CH_2 = CH-Cl$

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(A) The reaction of alkenes with halogen acids $(HX)$ proceeds via an electrophilic addition mechanism,where the rate-determining step is the formation of a carbocation intermediate.$1$. The stability of the carbocation formed determines the rate of reaction. More stable carbocations are formed faster.$2$. In $CH_2 = CH-Cl$,the chlorine atom exerts a strong $-I$ effect and a $+M$ effect. The $-I$ effect is dominant,which destabilizes the carbocation formed at the adjacent carbon atom,making the alkene less reactive towards electrophilic addition.$3$. In $CH_2 = CH_2$,$CH_3CH = CH_2$,and $(CH_3)_2C = CH_2$,the alkyl groups provide $+I$ effects and hyperconjugation,which stabilize the carbocation intermediate,thus increasing the rate of reaction.$4$. Therefore,$CH_2 = CH-Cl$ reacts at the slowest rate.

Which of the following will react with a halogen acid at the slowest rate?

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