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  4. The order of reactivities of the following alklyl halides for a SN2 reaction is

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Q. The order of reactivities of the following alklyl halides for a $SN^{2}$ reaction is

NTA AbhyasNTA Abhyas 2022

Solution:

The reactivity of the alkyl halide is decided by the ease with which the halide leaves the substrate. As with the decrease in size of halogen, C - X bond energy increases and so reactivity of alkyl halide decreases.
It means the leaving ability, order is $I^{-}>Br^{-}>Cl^{-}>F^{-}$ and the order of $S_{N}2$ ​ reaction is RI > RBr > RCl > RF.