C-11-Q057mediumsingle_mcqC2H2+H2O→20%H2SO4,2%HgSO4, 80 ∘C?\mathrm{C_2H_2 + H_2O \xrightarrow{20\% H_2SO_4, 2\% HgSO_4,\ 80\,^{\circ}\text{C}} ?}C2H2+H2O20%H2SO4,2%HgSO4, 80∘C?aCH3CHO\mathrm{CH_3CHO}CH3CHObC2H5OH\mathrm{C_2H_5OH}C2H5OHcCH3COOH\mathrm{CH_3COOH}CH3COOHdC2H6\mathrm{C_2H_6}C2H6