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How would the rate change in a reaction if you went from using an alkyl iodide...

How would the rate change in a reaction if you went from using an alkyl iodide to using an alkyl bromide? Specifically in a SN2 displacement of an alkyl halide.
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Answer #1

Alkyl Iodide is more reactive towards SN2 reaction than alkyl bromide. Since, iodine is bigger in size than Bromine so the bonds get longer so weaker the bond, the more easily it is broken (making iodide the good leaving group), the lower the activation energy for the reaction and the faster the rate at which it will occur.Also, iodine is less electronegative than bromine so the carbon-halide bonds is weaker in iodine than bromine , making alkyl iodidemore reactive.

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