CaCO3 -> CaC2 + COCaC2 + 2H2O -> C2H2 + Ca(OH)C2H2 + H2O -> C2H5OC2H5OH + HCl -> C2H5Cl + H2C2H5Cl -> C2H4 + HCl
CaCO3 -> CaC2 + CO
CaC2 + 2H2O -> C2H2 + Ca(OH)
C2H2 + H2O -> C2H5O
C2H5OH + HCl -> C2H5Cl + H2
C2H5Cl -> C2H4 + HCl