8-21 желательно во вложении , чтобы всё было понятно
CH3-COH + H2 = CH3-CH2-OH
OH
/
CH3-COH + HCN = CH3 – C – H
\
CN
CH3-COH + HBr =\\\
CH3-COH + KOH =\\\
CH3-COH + Ag2O = CH3-COOH + 2Ag↓
CH3-COH + 2Cu(OH)2 = CH3-COOH + Cu2O + H2O