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(D) The reactivity of alkyl halides towards $S_{N}2$ reactions depends on the steric hindrance around the electrophilic carbon atom.$S_{N}2$ reactivit

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$Q > R > P$

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(D) The reactivity of alkyl halides towards $S_{N}2$ reactions depends on the steric hindrance around the electrophilic carbon atom.$S_{N}2$ reactivity order is: $1^{\circ} > 2^{\circ} > 3^{\circ}$ alkyl halide.$(P) \ (CH_3)_2C(Br)CH_2CH_3$ is a $3^{\circ}$ alkyl halide (highly sterically hindered).$(Q) \ BrCH_2(CH_2)_3CH_3$ is a $1^{\circ}$ alkyl halide (least sterically hindered).$(R) \ CH_3CH(Br)(CH_2)_2CH_3$ is a $2^{\circ}$ alkyl halide.Therefore,the correct order of reactivity is $Q > R > P$.

Arrange the following organic halides in the correct order of reactivity towards $S_{N}2$ displacement:
$(P) \ (CH_3)_2C(Br)CH_2CH_3$
$(Q) \ BrCH_2(CH_2)_3CH_3$
$(R) \ CH_3CH(Br)(CH_2)_2CH_3$

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Arrange the following organic halides in the correct order of reactivity towards $S_{N}2$ displacement:$(P) \ (CH_3)_2C(Br)CH_2CH_3$$(Q) \ BrCH_2(CH_2)_3CH_3$$(R) \ CH_3CH(Br)(CH_2)_2CH_3$