Organic compounds and organic chemistry are thus named for historical reasons, not that they necessarily have anything to do with organisms (although they can).

Organic compounds and organic chemistry are thus named for historical reasons, not that they necessarily have anything to do with organisms (although they can). Generally it's carbon-hydrogen based molecules, for example, methane (CH4) is the simplest organic molecule. https://en.wikipedia.org/wiki/Organic_compounds https://en.wikipedia.org/wiki/Organic_compounds As to what is a biological molecule, well, that's a harder question. In a somewhat tautological way I'd probably say that's something coming from a biological organism.