Which is the correct order of the following a | vedclass

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(B) The reactivity of alkyl halides towards $S_{N}2$ reactions depends on the steric hindrance at the $\alpha$-carbon atom. The order of reactivity is

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$iii > i > ii$

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(B) The reactivity of alkyl halides towards $S_{N}2$ reactions depends on the steric hindrance at the $\alpha$-carbon atom. The order of reactivity is: primary $(1^{\circ})$ > secondary $(2^{\circ})$ > tertiary $(3^{\circ})$.In the given structures:(iii) is a primary alkyl halide ($1$-bromopentane).$(i)$ is a primary alkyl halide ($1$-bromo$-3-$methylbutane),but it has more steric hindrance at the $\beta$-carbon compared to (iii).(ii) is a secondary alkyl halide ($2$-bromo$-3-$methylbutane).Therefore,the correct order of reactivity for $S_{N}2$ is $(iii) > (i) > (ii)$.

Which is the correct order of the following alkyl halides for an $S_{N}2$ reaction?

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