CaC2+2H2O=C2H2+Ca(OH)2
2NaCl+2H2O=电解=2NaOH+H2+Cl2
H2+Cl2=点燃=2HCl
C2H2+HCl=一定条件=CH2CHCl
nCH2CHCl=一定条件=[CH2CHCl]n