Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is :

Step-by-step solution

N ₂( ~g )+ O ₂( ~g ) 2 NO ( g )2 NO ( g )+ O ₂( ~g ) 2 NO ₂( ~g ) Higher concentration of NO ₂ damage the leaves and retard the rate of photosynthesis.