Which among the following compounds undergoes $\mathrm{SN}^2$ reaction fastly?

Question

Aicharya · Accepted Answer

Reactivity for $\mathrm{SN}^2$ reaction (a) $\begin{aligned} & 	ext { Reactivity } \propto \frac{1}{	ext { steric hindrance of reactant }} \ & {\left[\mathrm{CH}_3-\mathrm{X}>1^{\circ}>2^{\circ}>3^{\circ} 	ext { Halide }ight]} \end{aligned}$ (b) If alkyl group of substrates are same then Reactivity $\propto$ L.G. Ability $[\mathrm{R}-\mathrm{I}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}]$ thus I undergoes $\mathrm{S}_{\mathrm{N}} 2$ reaction fastly

Which among the following compounds undergoes $\mathrm{SN}^2$ reaction fastly?

Solution