Among the bromides (I)-(III) given below,the | vedclass

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(C) The reactivity of alkyl halides in an $S_N1$ reaction depends on the stability of the carbocation intermediate formed after the departure of the l

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$II > III > I$

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(C) The reactivity of alkyl halides in an $S_N1$ reaction depends on the stability of the carbocation intermediate formed after the departure of the leaving group $(Br^-)$.$1$. For $(I)$,the carbocation formed is a cyclopentenyl cation,which is resonance stabilized.$2$. For $(II)$,the carbocation formed is a cyclopentadienyl cation,which is aromatic ($6 \pi$ electrons,$H$ückel's rule),making it exceptionally stable.$3$. For $(III)$,the carbocation formed is a pyrylium-like cation,which is resonance stabilized by the oxygen atom's lone pair,making it more stable than the simple cyclopentenyl cation but less stable than the aromatic cyclopentadienyl cation.Comparing the stabilities: The aromatic cation $(II)$ is the most stable,followed by $(III)$ due to oxygen's lone pair resonance,and $(I)$ is the least stable among the three.Therefore,the order of reactivity is $II > III > I$.

Among the bromides $(I)-(III)$ given below,the order of reactivity in $S_N1$ reaction is:

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