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Naphthalene is a polycyclic aromatic hydrocarbon (PAH) with the formula C10H8. The molecule consists of two benzene rings fused together. Naphthalene has a distinctive mothball odor and is volatile. The carbon–carbon bonds in naphthalene are aromatic and have a length of 1.36 Å. The bond length between two carbon atoms in benzene is 1.40 Å. The shorter bonds in naphthalene are due to the fact that the π electrons are delocalized and are able to occupy a larger space.