Which type of polymerization involves initiation, propagation, and termination steps?

Explanation

Addition polymerization is characterized by three key stages: initiation, where the reaction starts with the formation of active centers; propagation, where monomers add sequentially to the active center, forming a long chain; and termination, where the active chain ends its growth. This multi-step process distinguishes it from other polymerization methods. Condensation and step-growth polymerization do not follow a similar step-wise process and typically involve the formation of by-products. Ionic polymerization, although involving a chain reaction, uses ions and has different mechanisms and characteristics compared to addition polymerization.