2СH3=(t=2500)= C2H2 + 2H2
C2H2 + H2=C2H4 (катализатор Ni)
C2H4 + hBr= C2H5Br
C2H5Br + NaOH (водн)= C2H5OH + NaBr
C2H5OH + CuO= CH3-CHO + Cu +H2O
CH3-CHO + Cu(OH)2= CH3-COOH + Cu2O +2H2O
CH3-COOH + C2H5OH = CH3-CO-O-C2H5 + H2O
CH3-CO-O-C2H5 + NaOH= CH3-COONa + C2H5OH
Успехов!:)