CaCO3=CaO+CO2 CaO+3C=CaC2+CO CaC2+2HOH=Ca(OH)2+C2H2 C2H2+HOH=CH3-COH CH3-COH+Ag2O=CH3-COOH+2Ag CH3-COOH+Cl2=CH2(Cl)-COOH+HCl CH2(Cl)-COOH+NH3=CH2(NH2)-COOH+HCl