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Arrange the following in correct order towards $\mathrm{S}_{\mathrm{N}} 2$ reaction.
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The correct answer is:
III $>$ I $>$ IV $>$ II
(a) $\mathrm{S}_{\mathrm{N}} 2$ reactivity depends on steric crowding at the $\alpha$ - carbon and the $\mathrm{C}-\mathrm{X}$ bond strength.
Steric crowding $\uparrow, \mathrm{S}_{\mathrm{N}} 2$ reactivity $\downarrow$
C-X bond strength $\uparrow, \mathrm{S}_{\mathrm{N}} 2$ reactivity $\downarrow$
Thus, the order of reactivity towards $\mathrm{S}_{\mathrm{N}} 2$ will be :-
Steric crowding $\uparrow, \mathrm{S}_{\mathrm{N}} 2$ reactivity $\downarrow$
C-X bond strength $\uparrow, \mathrm{S}_{\mathrm{N}} 2$ reactivity $\downarrow$
Thus, the order of reactivity towards $\mathrm{S}_{\mathrm{N}} 2$ will be :-
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