Isopropyl alcohol (IPA) is an organic compound with the chemical formula C 3 H 8 O and CAS number 67-63-0. The preferred IUPAC name of the chemical is propan-2-ol, though it is sometimes called rubbing alcohol, 2-propanol, isopropanol, s-propanol, iPrOH, dimethyl carbinol, or sec-propyl alcohol.