What is C6 H4 O?

C6H4O is the molecular formula for a compound known as phenol or hydroxybenzene, which consists of a benzene ring with a hydroxyl (-OH) group attached. This compound is an important industrial chemical used in the production of plastics, resins, and pharmaceuticals. It has antiseptic properties and is also used in various chemical syntheses. The formula indicates that there are six carbon atoms, four hydrogen atoms, and one oxygen atom in the molecule.