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(C) The reactivity of haloarenes towards nucleophilic substitution $(OH^-)$ increases with the presence of electron-withdrawing groups $(-NO_2)$ at th

Vedclass · Accepted Answer

$II > IV > III > I$

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(C) The reactivity of haloarenes towards nucleophilic substitution $(OH^-)$ increases with the presence of electron-withdrawing groups $(-NO_2)$ at the ortho and para positions relative to the halogen atom.$II$: $2,4,6$-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 carbanion intermediate compared to ortho/para positions.Thus,the order of reactivity is $II > IV > III > I$.

Arrange the following compounds in the decreasing order of their reactivity towards $OH^-$: $m$-nitrobromobenzene $(I)$,$2,4,6$-trinitrobromobenzene $(II)$,$p$-nitrobromobenzene $(III)$,and $2,4$-dinitrobromobenzene $(IV)$.

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