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(B) The reactivity of alkyl halides in an $S_N1$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining

Vedclass · Accepted Answer

$(II) < (I) < (III)$

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(B) The reactivity of alkyl halides in an $S_N1$ reaction depends on the stability of the carbocation intermediate formed during the rate-determining step.The stability order of carbocations is: $3^{\circ} > 2^{\circ} > 1^{\circ}$.Let us analyze the carbocations formed from the given compounds:$(I)$ $CH_3-CH_2-CH^+(CH_3)$ is a $2^{\circ}$ carbocation.$(II)$ $(CH_3)_2CH-CH_2^+$ is a $1^{\circ}$ carbocation.$(III)$ $(CH_3)_3C^+$ is a $3^{\circ}$ carbocation.Since the stability order is $(II) < (I) < (III)$,the reactivity order in $S_N1$ reaction is $(II) < (I) < (III)$.

Predict the order of reactivity of the following compounds in $S_N1$ reaction :
$(I)$ $CH_3-CH_2-CH(Br)-CH_3$
$(II)$ $(CH_3)_2CH-CH_2-Br$
$(III)$ $(CH_3)_3CBr$

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Predict the order of reactivity of the following compounds in $S_N1$ reaction : $(I)$ $CH_3-CH_2-CH(Br)-CH_3$$(II)$ $(CH_3)_2CH-CH_2-Br$$(III)$ $(CH_3)_3CBr$