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The order of elementary reactions can be determined by the number of molecules participating in a collision.

Based on this knowledge, which of the following is LEAST likely to be an elementary reaction?


A unimolecular process such as $CH_3NC \longrightarrow CH_3CN$.


A bimolecular reaction such as $NO + O_3 \longrightarrow NO_2+ O_2$.


A trimolecular process such as $O + N_2O + N \longrightarrow NO_2+ N_2$.


A tetramolecular process such as $N_2+ 2H_2+ Cl_2 \longrightarrow 2NH_4Cl$.

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