Which of the following statements is incorrect for a bimolecular nucleophilic substitution reaction $(S_{N}2)$?
- AIt is a second-order reaction.
- BIn an $S_{N}2$ reaction,the substrate does not undergo heterolytic fission.
- CThe rate of an $S_{N}2$ reaction does not depend on the concentrations of both the substrate and the nucleophilic reagent.
- D$S_{N}2$ reaction occurs in a single step without forming an intermediate.
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