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
Solution, 2021
Indian Forest Service (Mains), Chemistry optional. 40 pages. Questions 1, 2, 3, 5 and 6 are answered.
Every question of 2021, one page each60 parts in 8 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Aromaticity classifications5 marks
- 1(b)Photochemical hydrogen migration in a diene5 marks
- 1(c)Isotope-labelled acetate pyrolysis5 marks
- 1(d)Kinetic enolate aldol sequence5 marks
- 1(e)Natural rubber and polyethylene5 marks
- 1(f)Phenol to a reduced aryl ether5 marks
- 1(g)Photochemical cleavage and alkene isomerization5 marks
- 1(h)Hyperfine lines of an isotopic radical5 marks
Question 2 40 marks
Question 3 40 marks
- 3(a)(i)Hydrogen exchange in cyclopropyl ketones5 marks
- 3(a)(ii)Strongly shielded internal methyl groups5 marks
- 3(b)(i)Carbon–carbon bond formation from a bromoester5 marks
- 3(b)(ii)Intramolecular aldol condensation5 marks
- 3(c)(i)ESR resonance field5 marks
- 3(c)(ii)Aromaticity of five-membered heterocycles5 marks
- 3(d)(i)Haworth synthesis of a methoxytetralone5 marks
- 3(d)(ii)Cyanide substitution on a nitroaryl halide5 marks
Question 4 40 marks
- 4(a)(i)Cyclopentadiene and methyl acrylate5 marks
- 4(a)(ii)Tetraphenylcyclopentadienone cycloaddition5 marks
- 4(b)Oxidation and oxidative cleavage5 marks
- 4(c)(i)Substitution versus elimination of a primary bromide5 marks
- 4(c)(ii)Alcohol to chloride with retention5 marks
- 4(d)(i)Regioselective hydration of allylbenzene5 marks
- 4(d)(ii)Nucleoside and nucleotide structures5 marks
- 4(e)Three rearrangement and condensation sequences5 marks
Question 5 40 marks
- 5(a)Condensation of diethyl succinate5 marks
- 5(b)DNA bases and pairing5 marks
- 5(c)Vinylcyclopropane rearrangement5 marks
- 5(d)Oxidation of 2-acetylpyridine5 marks
- 5(e)Azobenzene and hydrazobenzene5 marks
- 5(f)Nitration of indole5 marks
- 5(g)Acidity of cyclopentadiene derivatives5 marks
- 5(h)Photoproducts of ketone excitation5 marks
Question 6 40 marks
- 6(a)(i)Malonic ester ring synthesis5 marks
- 6(a)(ii)Wittig olefination5 marks
- 6(b)(i)Tertiary protein structure5 marks
- 6(b)(ii)End-group content of polystyrene5 marks
- 6(c)(i)Cyclization of a beta-hydroxy phenethylamide5 marks
- 6(c)(ii)Terylene from p-xylene5 marks
- 6(d)Fischer indole synthesis5 marks
- 6(e)Acid equivalent of nylon-6,65 marks
Question 7 40 marks
- 7(a)(i)A beta-chloroamine and sulfonyl chloride5 marks
- 7(a)(ii)Hydration followed by oxidation5 marks
- 7(b)Ireland–Claisen rearrangement of an allylic acetate10 marks
- 7(c)(i)Solvolysis of a tertiary allylic bromide5 marks
- 7(c)(ii)Ring expansion of vinylcyclobutane5 marks
- 7(d)Stability of triarylmethyl radicals5 marks
- 7(e)State-dependent diene chemistry and photo-Fries rearrangement5 marks
Question 8 40 marks
- 8(a)(i)Methylcyclohexenes by mass spectrometry5 marks
- 8(a)(ii)Hydroxy-methoxyacetophenone assignment5 marks
- 8(b)Identification of an aromatic diester10 marks
- 8(c)(i)Oxidative coupling of acetic anhydride5 marks
- 8(c)(ii)Cyclopentenone photocycloadditions5 marks
- 8(d)Photochemical cycloaddition and cleavage5 marks
- 8(e)IR distinctions between functional groups5 marks
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Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.