Indian Forest Service (Mains)
Chemistry optional
- 2 papers
- 200 marks each
- 3 h per paper
Paper II covers organic chemistry and spectroscopy.
All years
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Paper II, organic chemistry and spectroscopy
Question paper, 2025
Indian Forest Service (Mains), Chemistry optional. 11 pages, as issued by UPSC.
Every question of 2025, one page each44 parts in 8 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Aromaticity of small rings5 marks
- 1(b)Nitrene transfer to an alkene5 marks
- 1(c)Electrophilic substitution of heteroarenes5 marks
- 1(d)Elimination next to an existing alkene5 marks
- 1(e)Oxymercuration of norbornene5 marks
- 1(f)Medium-dependent pinacol rearrangement5 marks
- 1(g)Two thermal electrocyclic steps5 marks
- 1(h)Intramolecular Claisen condensation5 marks
Question 2 40 marks
Question 3 40 marks
Question 4 40 marks
Question 5 40 marks
Question 6 40 marks
- 6(a)(i)Photodecarbonylation of thujone5 marks
- 6(a)(ii)Photochemistry of an amino ketone5 marks
- 6(a)(iii)Di-pi-methane rearrangement5 marks
- 6(b)(i)Two ester NMR patterns5 marks
- 6(b)(ii)A symmetric malonate ester5 marks
- 6(c)(i)Number- and weight-average molar masses10 marks
- 6(c)(ii)Syn and anti dihydroxylation5 marks
Question 7 40 marks