The reactivity of 2-bromo-2-methylbutane (I), | vedclass

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(C) The reactivity of alkyl halides towards $S_N2$ reactions is primarily governed by steric hindrance.$S_N2$ reactions involve the nucleophilic attac

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$II > III > I$

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(C) The reactivity of alkyl halides towards $S_N2$ reactions is primarily governed by steric hindrance.$S_N2$ reactions involve the nucleophilic attack from the back side,which is hindered by the presence of bulky groups around the electrophilic carbon.Therefore,the order of reactivity is $1^{\circ} > 2^{\circ} > 3^{\circ}$.In the given compounds:$1-$bromopentane $(II)$ is a primary $(1^{\circ})$ alkyl halide.$2-$bromopentane $(III)$ is a secondary $(2^{\circ})$ alkyl halide.$2-$bromo$-2-$methylbutane $(I)$ is a tertiary $(3^{\circ})$ alkyl halide.Thus,the correct order of reactivity towards $S_N2$ displacement is $II > III > I$.

The reactivity of $2-$bromo$-2-$methylbutane $(I)$,$1-$bromopentane $(II)$ and $2-$bromopentane $(III)$ towards $S_N2$ displacement is such that :

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