Which of the following is an elementary reaction?

1. $\mathrm{C}_2 \mathrm{H}_5 \mathrm{I}_{(\mathrm{g})} \longrightarrow \mathrm{C}_2 \mathrm{H}_{4(\mathrm{~g})}+\mathrm{HI}_{(\mathrm{g})}$
2. $\mathrm{NO}_2 \mathrm{Cl}_{(\mathrm{g})} \longrightarrow 2 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$
3. $2 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{F}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NO}_2 \mathrm{~F}_{(\mathrm{g})}$
4. $\mathrm{NO}_{(\mathrm{g})}+\mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NaCl}_{(\mathrm{g})}$

Solution

Asked in: MHT CET 2024 (11 May Shift 1)

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