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
Elimination reactions: every question, 2021 to 2025
10 parts worth 60 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
E1, E2 and E1cb mechanisms; orientation in E2 reactions: Saytzeff and Hofmann; pyrolytic syn elimination: acetate pyrolysis, Chugaev and Cope eliminations.
Notes: Elimination reactions: E1, E2, E1cB, Saytzeff and Hofmann orientation, syn eliminations (full notes) · short notes
2025
- Q1(d) Elimination next to an existing alkene5 marks Answered
2024
- Q2(b)(iii) Rearrangement during solvolytic elimination5 marks Answered
- Q2(c)(i) Hofmann elimination10 marks Answered
- Q2(c)(ii) Chugaev elimination5 marks Answered
2023
- Q1(e) Dehydrobromination through an ion pair5 marks Answered
- Q4(b) Rates of alkoxide-induced elimination5 marks Question only
2022
- Q2(a) Two eliminations from a meso dibromide10 marks Question only
2021
- Q1(c) Isotope-labelled acetate pyrolysis5 marks Answered
- Q2(c)(ii) Hofmann elimination5 marks Answered
- Q2(d)(i) Elimination of 2-bromobutane5 marks Answered