C = monoester etilic , pt ca provine din etanol (reactia 2) => R-COOC2H5 ,
R+12+16x2+29 = R+73 g/mol
=>
100% ............................ 31,37% O
R+73.............................. 32 g O
=> R = 29
=> R = CH3CH2-
=> C = C2H5COOC2H5 = propionatul
CH3CH2OH + [O] --KMnO4/H(+)--> CH3COOH (B)
CH3CH2COOH + HOC2H5 --H(+)--> CH3CH2COOC2H5 (C)