The order of reactivities of the following al | vedclass

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(D) In an $S_{N}2$ reaction,the rate of reaction depends on the ability of the leaving group to depart. The leaving group ability is determined by the

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$RI > RBr > RCl > RF$

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(D) In an $S_{N}2$ reaction,the rate of reaction depends on the ability of the leaving group to depart. The leaving group ability is determined by the strength of the $C-X$ bond and the stability of the halide ion $(X^-)$. The bond strength decreases as the size of the halogen increases $(C-F > C-Cl > C-Br > C-I)$. Consequently,the iodide ion $(I^-)$ is the best leaving group because it is the weakest base,while the fluoride ion $(F^-)$ is the poorest leaving group. Therefore,the order of reactivity for $S_{N}2$ reactions is $RI > RBr > RCl > RF$.

The order of reactivities of the following alkyl halides for an $S_{N}2$ reaction is:

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