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
Biopolymers: every question, 2021 to 2025
7 parts worth 80 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
Structure of proteins, DNA and RNA.
Notes: Biopolymers: proteins, peptides, DNA and RNA (full notes) · short notes
2025
- Q1(e) Permanent and temporary denaturation of a protein10 marks Answered
- Q4(b)(iii) Salient features of the α-helix5 marks Question only
2024
- Q5(a) Bases of DNA and RNA; stability of DNA and RNA10 marks Answered
2023
- Q7(a) 2′-Deoxycytidine-3′-monophosphate; acidity; duplex stability; G≡C pairing15 marks Question only
2022
- Q5(a) Nucleosides, nucleotides and the primary structure of DNA and RNA10 marks Answered
- Q7(a) Secondary structures of proteins compared with tertiary structure15 marks Question only
2021
- Q6(b) Interactions that stabilise a protein, with the residues involved15 marks Question only
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