<p><strong>Noun</strong></p><ul><li>Any of a class of compounds containing only hydrogen and carbon, such as:<ul><li>Alkane (e.g., methane, CH₄)</li><li>Alkene (e.g., ethylene, C₂H₄)</li><li>Alkyne (e.g., acetylene, C₂H₂)</li><li>Aromatic compound (e.g., benzene, C₆H₆)</li></ul></li></ul>