The decreasing order of reactivity of m-nitro | vedclass

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(B) The reaction of aryl halides with $OH^{-}$ ions follows the $S_NAr$ (Nucleophilic Aromatic Substitution) mechanism.In $S_NAr$ reactions,the presen

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$II > IV > III > I$

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(B) The reaction of aryl halides with $OH^{-}$ ions follows the $S_NAr$ (Nucleophilic Aromatic Substitution) mechanism.In $S_NAr$ reactions,the presence of electron-withdrawing groups $(-NO_2)$ at ortho and para positions stabilizes the Meisenheimer complex intermediate.More $-NO_2$ groups at ortho and para positions lead to higher reactivity.- $II$ ($2,4,6$-trinitrobromobenzene) has three $-NO_2$ groups (two ortho,one para).- $IV$ ($2,4$-dinitrobromobenzene) has two $-NO_2$ groups (one ortho,one para).- $III$ ($p$-nitrobromobenzene) has one $-NO_2$ group (para).- $I$ ($m$-nitrobromobenzene) has one $-NO_2$ group (meta),which is less effective at stabilizing the intermediate compared to ortho/para positions.Therefore,the decreasing order of reactivity is $II > IV > III > I$.

The decreasing order of reactivity of $m$-nitrobromobenzene $(I)$,$2,4,6$-trinitrobromobenzene $(II)$,$p$-nitrobromobenzene $(III)$,and $2,4$-dinitrobromobenzene $(IV)$ towards $OH^{-}$ ions is

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