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why does Mg chose C-Br bond over C-Cl bond in the prep of grignard reagent?

why does Mg chose C-Br bond over C-Cl bond in the prep of grignard reagent?

Grade:12

2 Answers

Arun
25750 Points
4 years ago
the formation of a Grignard reagent from a compound possessing both bromine and chlorine, magnesium preferentially inserts into the C–Br bond over the C–Cl bond
Vikas TU
14149 Points
4 years ago
Dear student 
Simply put the C-Br bond is weaker than C-Cl, so oxidative addition occurs much faster. Oxidative addition is treated in more depth in any textbook on organometallic chemistry (the usual context is transition metals but it applies equally well to Mg). 
Good Luck 

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