1-Bromo-3-chloropropane is an organohalogen compound with the formula Br(CH<sub>2</sub>)<sub>3</sub>Cl. It is a colorless liquid, produced by free-radical addition of hydrogen bromide to allyl chloride. It is used as an alkylating agent to install the âÂÂ(CH<sub>2</sub>)<sub>3</sub>Cl and âÂÂ(CH<sub>2</sub>)<sub>3</sub>â groups. For example, it is a precursor to 4-chlorobutyronitrile.