Cac2-c2h2-ch3cho-ch3cooh-(ch3coo)2Mg
CaC2 + 2H2O -> Ca(OH)2 + C2H2 C2H2 + H2O -> CH3COH ( t) CH3COH + Ag2O -> CH3COOH + 2Ag 2CH3COOH + Mg -> (CH3COO)2Mg + H2