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
Rearrangements: every question, 2021 to 2025
17 parts worth 135 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
Pinacol-pinacolone, Hofmann, Beckmann, Baeyer-Villiger, Favorskii, Fries, Claisen, Cope, Stevens and Wagner-Meerwein rearrangements.
Notes: Molecular rearrangements (full notes) · short notes
2025
- Q1(f) Medium-dependent pinacol rearrangement5 marks Answered
- Q2(b) Dehydration with carbocation rearrangement10 marks Question only
- Q2(c) Favorskii reactions of two alpha-haloketones10 marks Question only
- Q3(a) Stevens rearrangements of two ylides10 marks Answered
2024
- Q1(f) Pulegone to a ring-contracted ester5 marks Answered
- Q3(b) Five rearrangement products15 marks Question only
2023
- Q1(f) Why nucleophilic shifts are common5 marks Answered
- Q2(c) Lewis-acid dehydration and rearrangement10 marks Answered
- Q4(e) Pinacol and Tiffeneau–Demjanov rearrangements5 marks Question only
- Q4(g) Two substrates, one Favorskii intermediate10 marks Question only
2022
- Q1(g) Rearrangement during silver-assisted solvolysis5 marks Answered
- Q1(h) Organolithium and Baeyer–Villiger sequence5 marks Answered
- Q2(b) Favorskii rearrangement of a dibromoketone10 marks Question only
- Q2(c) Rearrangement of a bornane alcohol10 marks Question only
- Q2(d) Claisen rearrangement of an allyl vinyl ether5 marks Question only
- Q3(c) Cinnamaldoxime rearrangement and ring closure10 marks Answered
2021
- Q4(e) Three rearrangement and condensation sequences5 marks Question only