At room temperature, 1,4-dichlorobenzene is a colorless to white combustible crystalline solid that slowly vaporizes when exposed to air. 1,4-Dichlorobenzene has a penetrating mothball-like odor. 1,4-Dichlorobenzene is partially soluble in water and soluble in organic solvents including alcohol, ether, benzene, chloroform, and carbon disulfide. 1,4-Dichlorobenzene vapor concentrations ranging from