Two elementary reactions are proposed

CHEMISTRY · Subjective · A Level · Chemistry · Rate equations · Rate equations

Problem

Two elementary reactions are proposed. Reaction A: O+O3⟶2 O2\text{O} + \text{O}_3 \longrightarrow 2\,\text{O}_2 Reaction B: NO+NO+O2⟶2 NO2\text{NO} + \text{NO} + \text{O}_2 \longrightarrow 2\,\text{NO}_2 Which reaction is termolecular, and briefly explain (one sentence) why such elementary steps are uncommon.

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