Осуществить превращения: CaC2 → C2H2 → CH3-CH2OH → CH3-CHO → CH3-COOH

CaC2 + 2H2O = Ca(OH)2 + C2H2↑
C2H2 + H2O —(Hg2+)→ CH3CHO
CH3CHO + H2 → CH3CH2OH
CH3CH2OH + CuO —(t)→ CH3CHO + Cu + H2O
СH3CHO + Ag2O —(t)→ CH3COOH + 2Ag