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SN2 reaction

  1. Nov 20, 2008 #1

    Which of these five compounds will react easier after an SN2 mechanism?

    Since Cl is more electronegative than I, it is a better leaving group, so I would expect the answer to be B or D.

    In B the halide is tertiary while in D it is primary, so I expect D to be the answer.

    The correct answer is E. Why?
  2. jcsd
  3. Nov 21, 2008 #2


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    Because iodide is a better leaving group than chloride. You should have a ranking of rates of reactions for homologous halides in the chapter somewhere.
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