Question

Arrange the following: $C{H}_{3}C{H}_{2}C{H}_{2}Cl\left(I\right),C{H}_{3}C{H}_{2}CHClC{H}_3\left(II\right){\left(C{H}_3\right)}_{2}CHC{H}_{2}Cl\left(III\right)and{\left(C{H}_3\right)}_{3}C-Cl\left(IV\right)$ in order of decreasing tendency towards $S{N}^2$ reaction

• A. I > III > II > IV
• B. III > IV > II > I
• C. II > I > III > IV
• D. IV > III > II > I

Answer 1

The correct option is A

I > III > II > IV

Lesser the bulkiness of alkyl halide, faster is the substitution by $S{N}^2$