Please explain why the answers are: 9. B 11. D 12. B The copolymerization of vinyl…

Please explain why the answers are:
9. B
11. D
12. B

The copolymerization of vinyl chloride and vinylidine chloride by free radical catalysis produces a polymer used in food wrap. Which structural unit would appear in this polymer? At which of the indicated positions would the bromine radical react at the fastest rate? 1 2 3 4 Which is the correct representation of the polymer formed by free-radical polymerization of this monomer? What product is formed in this reaction?