C2H4 is an organic compound composed of two carbon atoms and four hydrogen atoms. It is commonly referred to as ethene or ethylene, depending on the number of double bonds present. Ethene has one double bond and is represented by the chemical formula C2H4, while ethylene has two double bonds and is represented by the chemical formula C2H8. Both compounds are colorless, flammable gases at room temperature and are used in a variety of industrial processes.