convert ethyne to methanal
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CH3-CH3 + Cl2/light --------> CH3-CH2-Cl
CH3-CH2-Cl + KOH (aq) ---------> CH3-CH2-OH
CH3-CH2-OH + K2Cr2O7/H2SO4 --------------> CH3-COOH
CH3-COOH + NaOH --------> CH3-COONa
CH3-COONa + CaO + NaOH + heat ---------> CH4
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