Chemistry - Halogen Derivative Question with Solution | TestHub

Hint: $S_{N}2$ reaction rate depends upon the nucleophilicity of the attacking nueleophile. Here the 2 in the notation stands for Bimolecularity. Tert-butyl substrate fails in ${\mathrm{S}}_{\mathrm{N}}2$ due to crowding. Optical rotation does not change necessarily from $(+)$ to $(-)$ or $(-)$ to $(+)$, as the product is not necessarily an isomer of reactant.