Ortho-chlorophenol (OCP) is a chemical compound with the molecular formula C6H4ClOH. It is a colorless to brown crystalline solid that is soluble in water and has a strong, phenolic odor. OCP is used primarily as a pesticide and herbicide, and as a disinfectant in the wood preservation and pulp and paper industries. It is also used as an intermediate in the manufacture of various chemicals, including pharmaceuticals, dyes, and resins. OCP is toxic and can cause skin and eye irritation upon contact, and can be harmful if ingested or inhaled. It is classified as a hazardous substance and should be handled with caution and proper safety measures, including the use of protective clothing, gloves, and goggles. OCP can also be harmful to the environment, particularly to aquatic organisms, and it should be properly disposed of in accordance with local regulations.