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
Delocalised covalent bonding: every question, 2021 to 2025
11 parts worth 55 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
Aromaticity, anti-aromaticity; annulenes, azulenes, tropolones, kekulene, fulvenes, sydnones.
Notes: Aromaticity: Hückel rule, antiaromaticity, annulenes, azulene, tropolone, fulvene, sydnones (full notes) · short notes
2025
- Q1(a) Aromaticity of small rings5 marks Answered
- Q4(c)(i) Acidity and aromatic conjugate bases5 marks Answered
2024
- Q1(a) Annulenes and aromaticity5 marks Answered
- Q1(c) Five aromaticity decisions5 marks Answered
2023
- Q1(a) Aromaticity of heterocycles5 marks Answered
2022
- Q1(a) Pyridine versus imidazole5 marks Answered
- Q3(d) Aromatic character of diazines5 marks Answered
2021
- Q1(a) Aromaticity classifications5 marks Answered
- Q3(a)(i) Hydrogen exchange in cyclopropyl ketones5 marks Answered
- Q3(c)(ii) Aromaticity of five-membered heterocycles5 marks Answered
- Q5(g) Acidity of cyclopentadiene derivatives5 marks Answered