Problem: In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate. R-Cl, R-I, R-F, R-Br

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Rate of reaction follows the order: R−I > R−Br > R−Cl > R−F

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Problem Details

In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate. 

R-Cl, R-I, R-F, R-Br