Allyl bromide (CAS No. 106‑95‑6; formula C₃H₅Br; MW ≈ 120.98 g/mol) is a colorless to light-yellow liquid with a pungent odor and strong alkylating ability. It is slightly soluble in water, highly flammable, and widely used as an intermediate in the synthesis of pharmaceuticals, polymers, fragrances, and fine chemicals.