Write the set of elmentary reactions analogous to (5) to (11) that comporomis the free radical chain polymerizations of vinyl acetate (CH2-CHOC(O)CH3) and methyl methacrylate (CH2-C(CH3) C(O)OCH3) when this process is initiated by azobisisobutyronitrile. If carbon tertrachloride is added to the systems, describe the effects of chain transfer with carbon tetrachloride on the polymer composition and average molecular weight.