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Q.

Which will undergo $S_{N} 2$ reaction, fastest among the following halogen compounds

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a

${CH}_{3} {CH}_{2} Br$

b

${CH}_{3} {CH}_{2} I$

c

${CH}_{3} {CH}_{2} Cl$

d

${CH}_{3} {CH}_{2} F$

answer is D.

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Detailed Solution

This reactivity order reflects both the strength of the C–X bond, and the stability of X^- as a leaving group.
Thus, for a given alkyl group, the reactivity of the halide, R-X, follows the same order in both SN₁ & SN₂mechanisms as follows: R–I > R–Br > R–Cl >> R–F.

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