Answer: Phenol and formaldehyde.
- A Phenol and formaldehyde
- B Ethylene and propylene
- C Styrene and butadiene
- D Nylon and polyester
Correct answer: A. Phenol and formaldehyde
Explanation: Bakelite is a thermosetting polymer made by condensation of phenol with formaldehyde.
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.