In Wacker process, when mixture of propene and air is passed through mixture of Pd and CuCl2​ at high pressure acetone is formed. Pd + CuCl2​ → PdCl2​ + 2CuCl 4CuCl + HCl + O2​ → 4CuCl2​+2H2​OPropaneCH3​CH​=CH2​+PdCl2​ + H2​O → CH3​COCH3​ + Pd + 2HCl