1) CH2=CH2 +HCL  =  CH3-CH2-CL

2) CH3-CH2-CL+ HOH  =  CH3-CH2-OH  +  HCL

3) CH3-CH2-OH  + CuO = CH3-COH +CuO + H2O

4) CH3COH + Ag2O  =  CH3-COOH + 2Ag