UPSC Civil Services (Mains)
Chemistry optional
- 2 papers
- 250 marks each
- 3 h per paper
- 5 of 8 questions, Q1 and Q5 compulsory
Paper II covers organic chemistry and spectroscopy.
All topics
Paper II, organic chemistry and spectroscopy
Delocalised covalent bonding: every question, 2021 to 2025
8 parts worth 60 marks have been set on this unit in UPSC CSE 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, fulvenes, sydnones.
Notes: Aromaticity: Hückel rule, antiaromaticity, annulenes, azulene, tropolone, fulvene, sydnones (full notes) · short notes
2025
- Q1(a) Tropolone, fulvene and pseudo-aromaticity10 marks Answered
2024
- Q1(a)(i) Aromatic, non-aromatic or antiaromatic5 marks Answered
- Q1(a)(ii) Diphenylcyclopropenone resists nucleophilic addition5 marks Answered
2023
- Q1(a)(i) Acidity of cyclopentadiene5 marks Answered
- Q1(a)(ii) Hydrogen exchange in cyclopropyl and cyclopropenyl ketones5 marks Answered
- Q2(a)(i) Aromatic, antiaromatic or non-aromatic by the Hückel rule5 marks Answered
2022
2021
Printed copy and Kindle
UPSC Civil Services (Main) Chemistry Paper II: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Mechanisms drawn out and labelled on the scheme
- Topic-wise weightage and a topic-wise index