N2,C2H4\mathrm{N}_{2}, \mathrm{C}_{2} \mathrm{H}_{4}N2,C2H4
NH3,O2\mathrm{NH}_{3}, \mathrm{O}_{2}NH3,O2
NO2,CO2\mathrm{NO}_{2}, \mathrm{CO}_{2}NO2,CO2
O3, N2O\mathrm{O}_{3}, \mathrm{~N}_{2} \mathrm{O}O3, N2O