Chlorinated aromatic hydrocarbons are organic compounds that contain both chlorine atoms and an aromatic ring structure. These compounds are derived from hydrocarbons, which are molecules made up of hydrogen and carbon. The presence of chlorine can alter the chemical properties and reactivity of these compounds, making them useful in various industrial applications. Common examples of chlorinated aromatic hydrocarbons include polychlorinated biphenyls (PCBs) and dichlorobenzene. These substances are often used as solvents, pesticides, and in the production of other chemicals. However, they can also pose environmental and health risks due to their persistence in the environment and potential toxicity.