Answer: Glycerol and phthalic acid.
- A Ethylene glycol and phthalic acid
- B Adipic acid and hexamethylenediamine
- C Glycerol and phthalic acid
- D Styrene and butadiene
Correct answer: C. Glycerol and phthalic acid
Explanation: Glyptal (alkyd resin) is formed from glycerol (a triol) and phthalic acid, giving a cross-linked polyester.
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.