Indian Forest Service (Mains)
Chemistry optional
- 2 papers
- 200 marks each
- 3 h per paper
Paper II covers organic chemistry and spectroscopy.
All topics
Paper II, organic chemistry and spectroscopy
Preparation and properties of polymers: every question, 2021 to 2025
11 parts worth 75 marks have been set on this unit in UPSC IFoS Chemistry Paper II from 2021 to 2025. Each one opens on its own page with the question, the answer in brief and the key points.
Syllabus
Organic polymers: polyethylene, polystyrene, polyvinyl chloride, Teflon, nylon, terylene, synthetic and natural rubber. Inorganic polymers: phosphonitrilic halides, borazines, silicones and silicates.
Notes: Polymers: polymerisation, Ziegler–Natta and molar mass (full notes) · short notes
2025
- Q7(a)(i) Polyphosphazene formation and solubility10 marks Question only
- Q7(a)(ii) Preparation and branching of silicones10 marks Question only
2024
- Q6(b)(i) Living anionic polymerization10 marks Question only
- Q6(b)(ii) Silicone structure and stability5 marks Question only
2023
- Q5(a) Substituent effects on anionic propagation5 marks Answered
- Q7(b) Sequential anionic polymerization5 marks Answered
- Q7(c) Neoprene and chloroprene5 marks Answered
2022
- Q5(b) Stopping radical styrene polymerization5 marks Answered
- Q6(a) Epoxy resins10 marks Question only
2021
- Q1(e) Natural rubber and polyethylene5 marks Answered
- Q6(c)(ii) Terylene from p-xylene5 marks Answered