C-11-Q040mediumsingle_mcqইথানয়িক এসিডের সংকেত—aCH3COOH\mathrm{CH_3COOH}CH3COOHbC2H5OH\mathrm{C_2H_5OH}C2H5OHcCH3CHO\mathrm{CH_3CHO}CH3CHOdHCOOH\mathrm{HCOOH}HCOOH