**Molecularity** of an elementary reaction refers to:
AThe stoichiometric coefficient of the product
BThe sum of exponents in the rate law
CThe number of reacting molecules involved in the elementary step
DThe order of the slowest step always
Answer & Solution
Correct answer: C. The number of reacting molecules involved in the elementary step
Molecularity = the number of reactant molecules participating in a **single elementary step**. It is a theoretical quantity (always an integer ≥ 1), distinct from the experimentally measured order.
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