Q. Which of the following are addition polymers formed by polymerization of alkenes?

1. Polyethylene
2. Polypropylene
3. Polystyrene
4. PTFE

Select the correct option using the codes given below:
Answer: 1, 2, 3 and 4
Notes: All four—Polyethylene (from ethene), Polypropylene (from propene), Polystyrene (from styrene), and PTFE (from tetrafluoroethene)—are addition polymers produced through polymerization of alkenes. Each is formed by the addition of monomer units with unsaturated double bonds, classifying them as addition polymers.