Answer: Repeated addition of monomers with double bonds, no byproduct.
- A Repeated addition of monomers with double bonds, no byproduct
- B Stepwise condensation of monomers with loss of water according to standard textbooks
- C Cross-linking of pre-formed linear chains alone in general practice
- D Ionic bonding between charged monomer units as frequently described
Correct answer: A. Repeated addition of monomers with double bonds, no byproduct
Explanation: Addition polymerisation occurs with monomers containing C=C; no small molecule is released as byproduct.
Addition polymerisation simply links monomers containing a double bond with nothing left over, while condensation polymerisation joins two different monomers through a reaction (often forming an ester or amide bond) that releases a small molecule like water at each step.
Concept context
Large molecules made of repeating monomer units. Covers addition and condensation polymerisation, natural and synthetic polymers (nylon, PVC, Bakelite, natural rubber), and their real-world industrial applications.