All Organic Compounds always contain this element, and also usually contain this other element.
Carbon, usually Hydrogen
All organic compounds always contain the element carbon. This is because organic compounds are defined as compounds that contain carbon atoms bonded to other carbon atoms or to atoms of other elements such as hydrogen, oxygen, nitrogen, sulfur, and halogens.
Organic compounds also usually contain the element hydrogen. This is because most carbon-containing molecules tend to bond with hydrogen atoms to fill their outer electron shells and achieve greater stability. The ratio of carbon to hydrogen will vary greatly depending on the specific organic molecule in question and its functional group.
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