1: 90 percent / hydrogen chloride gas / ethanol 2: 96 percent / H2O 3: 18 percent / conc. H2SO4 / 1.5 h / Heating 4: 69 percent / polyphosphoric acid / 0.67 h / 150 °C 5: 60 percent / 10percent sodium hydroxide / H2O / 1.5 h / Heating 6: 60 percent / copper powder / solid / Heating View Scheme

1: methanol 2: aqueous H2SO4 View Scheme