The order of reactivity of the following alkyl halides for a SN 2 reaction is (a) RF>RCl>RBr>RI

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The order of reactivity of the following alkyl halides for a...

The order of reactivity of the following alkyl halides for a $\mathrm{S}_{\mathrm{N}} 2$ reaction is (a) $\mathrm{RF}>\mathrm{RCl}>\mathrm{RBr}>\mathrm{RI}$ (b) $\mathrm{RF}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RI}$ (c) $\mathrm{RCl}>\mathrm{RBr}>\mathrm{RF}>\mathrm{RI}$ (d) $\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}$

The order of reactivity of the following alkyl halides for a $\mathrm{S}_{\mathrm{N}} 2$ reaction is
(a) $\mathrm{RF}>\mathrm{RCl}>\mathrm{RBr}>\mathrm{RI}$
(b) $\mathrm{RF}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RI}$
(c) $\mathrm{RCl}>\mathrm{RBr}>\mathrm{RF}>\mathrm{RI}$
(d) $\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}$

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Key Concepts

SN2 Reaction Mechanism

The SN2 reaction is a bimolecular nucleophilic substitution that occurs in a single, concerted step. In this mechanism, the nucleophile attacks the electrophilic carbon from the backside, leading to an inversion of configuration. The rate of the reaction depends directly on the concentration of both the substrate and the nucleophile.

Steric Hindrance

Steric hindrance refers to the crowding around the electrophilic carbon center caused by bulky substituents, which can impede the approach of the nucleophile in an SN2 reaction. Lower steric hindrance in less substituted alkyl halides makes the backside attack more feasible, thereby increasing the reaction rate.

Leaving Group Ability

Leaving group ability is a crucial factor in determining the rate of SN2 reactions. A good leaving group can stabilize the negative charge upon departure, facilitating the reaction. Generally, the ability increases as the size of the halide increases, meaning iodide is a better leaving group than bromide, which in turn is better than chloride and fluoride.

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