Why does CH3Br react faster with hydroxyl ions (OH^-) than CH3Cl?
In the halogen series, Br has a weaker bond with the CH3 than Cl. Smaller halogen atoms have a larger electron affinity to fill the outer shell. The greater tendncey of CH3Br to break up into a CH3+ ion increases its reactivity with OH-
Chemistry is not my field of expertise, so you may get a better answer from another staff member.
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