The correct order of S_N1 reactivity for the | vedclass

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(B) The reactivity of alkyl halides towards $S_N1$ reactions depends on the stability of the intermediate carbocation formed.$(I)$ $CH_3CH_2CH_2CH_2Br

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$II > III > I$

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(B) The reactivity of alkyl halides towards $S_N1$ reactions depends on the stability of the intermediate carbocation formed.$(I)$ $CH_3CH_2CH_2CH_2Br$ forms a primary $(1^{\circ})$ carbocation,$CH_3CH_2CH_2CH_2^+$,which is the least stable.$(II)$ $CH_2=CH-CH(Br)CH_3$ forms an allylic carbocation,$CH_2=CH-CH^+CH_3$,which is resonance-stabilized and thus the most stable.$(III)$ $CH_3CH_2CH(Br)CH_3$ forms a secondary $(2^{\circ})$ carbocation,$CH_3CH_2CH^+CH_3$,which is more stable than a primary carbocation but less stable than a resonance-stabilized allylic carbocation.Therefore,the order of stability of carbocations is $II > III > I$.Since $S_N1$ reactivity follows the order of carbocation stability,the correct order is $II > III > I$.

The correct order of $S_N1$ reactivity for the following compounds is:
$(I)$ $CH_3CH_2CH_2CH_2Br$
$(II)$ $CH_2=CH-CH(Br)CH_3$
$(III)$ $CH_3CH_2CH(Br)CH_3$

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The correct order of $S_N1$ reactivity for the following compounds is:$(I)$ $CH_3CH_2CH_2CH_2Br$$(II)$ $CH_2=CH-CH(Br)CH_3$$(III)$ $CH_3CH_2CH(Br)CH_3$