👉 In chemistry, a photochemical reaction is an interaction between light and chemical molecules. The term "photochlorination" refers to the phenomenon where sunlight interacts with chlorophyll in plants, resulting in a change in the color of the leaves. In this context, "chlorophyll," which is responsible for photosynthesis, acts as a catalyst or reagent that helps to speed up the reaction and make it more efficient. The photochemical reaction causes the chlorophyll molecules to absorb light energy from