For the proposed elementary process , the molecularity of the reaction is: — Reaction Mechanism Chemistry Question

💡 Solution & Explanation

Molecularity is defined as the number of reactant molecules taking part in an elementary step. For the elementary step $2X + Y \rightarrow \text{products}$, there are $2$ molecules of $X$ and $1$ molecule of $Y$ colliding simultaneously. Thus, the molecularity is $2 + 1 = 3$.