Question
Which one compound from the following pairs would undergo $S_N2$ faster from the?
Image

Answer

(1) Sincey Image s a primary halide it undergoes $S_N2$ reaction faster than Image.
(2) Since iodine is a better leaving group than chloride, $1$-iodo propane $(CH_3CH_2CH_2I)$ undergoes $S_N2$ reaction faster than l-chloropropane $(CH_3CH_2CH_2CI)$.

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