Which of the following statements about order of reaction is incorrect?

Explanation

The statement that the order of a reaction is always equal to its molecularity is incorrect. Molecularity refers to the number of molecules participating in a single elementary step of a reaction, and it is always an integer. Reaction order, however, is the sum of the exponents of reactant concentrations in the rate equation, which is determined experimentally and can be fractional or differ from molecularity.Option A is incorrect because the reaction order does not determine the mechanism, though it provides information about the kinetics. Option B is incorrect because the reaction order is indeed determined experimentally. Option C is incorrect because the order of a reaction is associated with the rate equation, indicating how reactant concentrations affect the rate.