1,3-pentadiene is a hydrocarbon with the chemical formula C5H6. It consists of five carbon atoms and contains two double bonds between the first and second, and the third and fourth carbon atoms. This structure classifies it as a conjugated diene, which means the double bonds are separated by a single bond, allowing for unique chemical properties. This compound is typically a colorless gas at room temperature and is used in various chemical reactions, including polymerization. 1,3-pentadiene can be found in some natural sources and is also produced synthetically for use in the manufacture of rubber and other materials.