由苍白色火焰与X+Z-→X:H,Z:Cl
再往下2个X2可与1个Y2化合为X2Y：(X2Y可能为水或硫化氢）再有为液体得X2Y为H2O Y：O XZ:HCl X2Y:H2O Z2+X2Y:Cl+H2O→←HCl+HClO