I have been thinking of the rate of reaction of aryl bromide and aryl chloride with $\ce{Mg}$ to form Grignard.

When considering the electronegativities the carbon in aryl chloride is more positively polarized. But when considering the bond energies carbon chlorine bond is stronger.

I want to know which factor is more significant when we consider the reaction rates of aryl chloride and aryl bromide with $\ce{Mg}$ to form Grignard.

  • $\begingroup$ Bond energy is key. Magnesium is easily electropositive enough to barrel its way in unless facing a high activatiin energy. $\endgroup$ – Oscar Lanzi Jun 25 at 15:57
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    $\begingroup$ So that means aryl bromide forms grignard faster than aryl chloride right? $\endgroup$ – AfiJaabb Jun 26 at 7:46
  • $\begingroup$ On target. In fact bromides generally react faster than chlorides. $\endgroup$ – Oscar Lanzi Jun 26 at 9:30

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