Answer :


Ethyl iodide would undergo SN2 reaction faster because Iodide ion is a good leaving group. For a given alkyl group the reactivity is of the order R-I> R-Br> R-Cl R-F.


Explanation: SN2 reaction occurs easily when the substrate has a good leaving group and is attacked by a strong nucleophile. In the above, Iodide is larger in size and forms a stable anion therefore, it is considered as a good leaving group and hence ethyl iodide undergoes reaction faster.


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