Which of the following is an elementary reaction?
- A$C_2H_5I_{(g)} \longrightarrow C_2H_{4(g)} + HI_{(g)}$
- B$2NO_2Cl_{(g)} \longrightarrow 2NO_{2(g)} + Cl_{2(g)}$
- C$2NO_{2(g)} + F_{2(g)} \longrightarrow 2NO_2F_{(g)}$
- D$2NO_{(g)} + Cl_{2(g)} \longrightarrow 2NOCl_{(g)}$
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