Which one of the following is a second order reaction?
- A$H_{2} + Br_{2} \longrightarrow 2 HBr$
- B$NH_{4}NO_{3} \longrightarrow N_{2} + 3 H_{2}O$
- C$H_{2} + Cl_{2} \xrightarrow{\text{sunlight}} 2 HCl$
- D$CH_{3}COOCH_{3} + NaOH \longrightarrow CH_{3}COONa + CH_{3}OH$
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