Explain the following statements a The molecular mass of radical chain polymers is said to be independent of time.b. Ring-opening polymerization has the characteristics of condensation polymerizationc The rate of radical polymerization reaction depends only on the rate of its propagation reaction.d Anionic chain polymerization is said to be different from other chain polymerizations.e The amount of initiator determines the number of polymer chains in cationic chain polymerization.