Question

why some leaves have different colour instead of green

Answer 1

That's because pigments absorbsome wavelengths of light and reflect others. A yellow pigment is one that absorbs all of the wavelengths of light except yellow. 

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Answer 2

green leaves have different colours because the chlorophyll breaks down and the green colour disappears, and the yellow or orange colours become visible and give the leaves  the new colour . At the same time other chemical changes may occur, which form additional colours through the development of red anthocyanin pigments