xanthophyll and a hydrocarbon
xanthophyll level in ground level plants
Xanthophylls (originally phylloxanthins ) are yellow pigments that occur widely in nature and form one of two major divisions of the carotenoid group; the other division is formed by the carotenes . The name is from Greek xanthos (ξανθός, "yellow")  and phyllon (φύλλον, "leaf"),  due to their formation of the yellow band seen in early chromatography of leaf pigments.
If chlorophyll is green, how is it possible that leaves turn red, gold, and orange in the fall? With a few simple materials, you can easily discover the answer to this question.