Ch3cl-c2h6-c2h5br-c2h5-oh-ch3-c=o
CH3Cl + NaOH = CH2=CH2
CH2=CH2 + H2 = C2H6
C2H6 + Br2 = C2H5Br + HBr
C2H5Br + KOH = C2H5OH
C2H5OH + CuO --t--> CH3C(=O)-H