Chemistry - Chemical Kinetics Question with Solution | TestHub

A second-order reaction is not necessarily elementary; it may also be a complex reaction involving multiple steps.
Only elementary reactions have order equal to molecularity.
Bimolecular elementary reactions are always second order, so statement (B) is correct.
Zero-order and first-order reactions can arise from complex mechanisms, so (C) and (D) are also correct.
Hence, the incorrect statement is (A).