C2H4 + H2O \(\xrightarrow[Axit]{xt}\) C2H5OH (X: C2H4)
C2H5OH + O2 \(\xrightarrow[giấm]{men}\) CH3COOH + H2O (Y: CH3COOH)
2CH3COOH + Na2O → 2CH3COONa + H2O
CH3COONa + NaOH \(\xrightarrow[CaO]{to}\) CH4 + Na2CO3 (Z: CH4)
2CH4 \(\underrightarrow{to}\) C2H2 + 3H2