Answer: Hydrogen bonding.
- A Van der Waals forces
- B Hydrogen bonding
- C Metallic bonding
- D Coordinate bonding
Correct answer: B. Hydrogen bonding
Explanation: Fibres have close-packed chains held by strong hydrogen bonding (and dipole forces), which gives them high tensile strength and crystallinity.
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.