Chlorobenzene is primarily used as an intermediate in the production of various industrial chemicals. It serves as a key raw material in the synthesis of phenol, which is further utilized in the manufacture of plastics, adhesives, and coatings. Additionally, it is employed in the production of nitrochlorobenzenes, which are essential for making dyes, rubber chemicals, and pesticides. In the past, chlorobenzene was also used as a solvent for degreasing metal surfaces and in the formulation of certain paints and adhesives, though its use as a solvent has declined due to environmental and health concerns. It also finds application in the pharmaceutical industry as a reagent or intermediate in the synthesis of active pharmaceutical ingredients (APIs).