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  4. Which will undergo SN2 reaction fastest among the following halogen compounds?

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

KEAMKEAM 2012

Solution:

$S _{ N } 2$ reactions involve the formation of intermediate transition state, thus less hindered alkyl halide readily undergoes $S _{ N } 2$ reaction.

Moreover, $C - I$ bond is less stable than $C - Br$ or C-Cl bond, thus alkyl iodides are more reactive as compared to other halides.

Hence, $CH _{3} CH _{2} I$ is most reactive towards $S _{ N } 2$ reaction.