Why organic compounds are more abundant than inorganic compounds?
They are not more abundant in the sense that there are more kiliograms of them around than of inorganic compounds. Rather, carbon atoms bond to one another, whereas other elements tend not to do so. The number of geometrical combinations of carbon atoms with one another and with other elements like H, O, N, and S leads to an (almost) infinite number of possibilities. This is contrasted with limited possibilities for NaCl, CaCl2, AlCl3, of which there is only one possibility for any two elements. So if this is for a written test, that’s your answer. However, if this is one-on-one with a teacher, and you want to be subversive, you can argue that inorganic compounds are at least as abundant in those terms as organic. Take the aluminosilicates, for example. These compounds have as many possibilities for forming more and different molecules as carbon. Also, they can form large molecules, like carbon. And that’s just the aluminosilicates.