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(C) The reactivity of halides towards $S_N1$ mechanism depends on the stability of the carbocation intermediate formed. $(I)$ $CH_3CH_2CH_2Cl$ forms a

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$II > III > I$

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(C) The reactivity of halides towards $S_N1$ mechanism depends on the stability of the carbocation intermediate formed. $(I)$ $CH_3CH_2CH_2Cl$ forms a $1^\circ$ carbocation: $CH_3CH_2CH_2^+$. $(II)$ $CH_2=CHCHClCH_3$ forms an allylic carbocation: $CH_2=CHCH^+CH_3$,which is highly stabilized by resonance. $(III)$ $CH_3CH_2CHClCH_3$ forms a $2^\circ$ carbocation: $CH_3CH_2CH^+CH_3$. The order of stability of carbocations is: Allylic $(II) > 2^\circ (III) > 1^\circ (I)$. Therefore,the decreasing order of $S_N1$ reactivity is $II > III > I$.

Arrange the following halides in decreasing order of $S_N1$ reactivity:
$(I)$ $CH_3CH_2CH_2Cl$
$(II)$ $CH_2=CHCHClCH_3$
$(III)$ $CH_3CH_2CHClCH_3$

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Arrange the following halides in decreasing order of $S_N1$ reactivity: $(I)$ $CH_3CH_2CH_2Cl$ $(II)$ $CH_2=CHCHClCH_3$ $(III)$ $CH_3CH_2CHClCH_3$