In an SN₂ reaction, the rate depends on how easily the leaving group departs. Among alkyl halides, iodide (I⁻) is the best leaving group because of its large size and weak C–I bond. Therefore, methyl iodide (CH₃I) reacts most rapidly in SN₂ mechanisms compared to bromide or chloride derivatives.
Which of the following halides will react most rapidly in a SN2 reaction?
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