Answer: Long sequences of one monomer followed by long sequences of another.
- A Long sequences of one monomer followed by long sequences of another
- B Generally alternating single units of two different monomers as generally observed
- C Two different monomers distributed in a largely random sequence overall
- D Mainly a single type of monomer repeated throughout most of the chain length
Correct answer: A. Long sequences of one monomer followed by long sequences of another
Explanation: Block copolymers have distinct segments (blocks) of different monomers, e.g., A-A-A-A-B-B-B-B.
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.