Осуществите превращения: CH3-CH3->CH2=CH2->CH3-CH2OH->CH3-CH=O->CH3-COOH
c2h6 = c2h4 + h2
c2h4 + h2o = c2h5oh
c2h5oh + cuo = ch3cho + cu + h2o
ch3cho + ag2o = ch3cooh + 2ag