The SN2 reaction of hydroxide with bromomethane is described as bimolecular because ____.
Correct answer C. two species, the alkyl halide and the nucleophile, take part in the rate-determining step
Explanation
Molecularity counts the species colliding in the rate-determining step. In SN2 both CH₃Br and OH⁻ are involved in that single step, so it is bimolecular and second order overall.
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