CO2= (C6H10O5)n=C6H12O6+C6H12O6 C6H12O6=CH3-CH2-OH+CO2 CH3-CH2-OH+CuO=CH3-COH+Cu+H2O CH3-COH+Ag2O=CH3-COOH+2Ag (C6H10O5)n+CH3-COOH=(C6H10O5-CH3-COO)n+H2O