Indian Forest Service (Mains)
Chemistry optional
- 2 papers
- 200 marks each
- 3 h per paper
Paper II covers organic chemistry and spectroscopy.
All years
Pages 1 and 2 of 31 
Pages 3 and 4 of 31 
Pages 5 and 6 of 31 
Pages 7 and 8 of 31
Pages 9 and 10 of 31 Pages 11 and 12 of 31 Pages 13 and 14 of 31 Pages 15 and 16 of 31 Pages 17 and 18 of 31 Pages 19 and 20 of 31 Pages 21 and 22 of 31 Pages 23 and 24 of 31 Pages 25 and 26 of 31 Pages 27 and 28 of 31 Pages 29 and 30 of 31 Page 31 of 31
Paper II, organic chemistry and spectroscopy
Solution, 2016
Indian Forest Service (Mains), Chemistry optional. 31 pages. Questions 1, 2, 4, 5 and 7 are answered.
Every question of 2016, one page each46 parts in 8 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Aromatic, antiaromatic or non-aromatic5 marks
- 1(b)Crossover experiments5 marks
- 1(c)Quinuclidine against triethylamine with ethyl iodide5 marks
- 1(d)Order of carbocation stability5 marks
- 1(e)Basicity of pyrrole, triethylamine and pyridine5 marks
- 1(f)Saytzeff and Hofmann eliminations5 marks
- 1(g)6,6-Dimethylfulvene, phenyllithium and acetaldehyde5 marks
- 1(h)Pinacol rearrangement with ring expansion5 marks
Question 2 40 marks
- 2(a)(i)(S)-2-Bromobutane with HCOOH and with HCOO⁻Na⁺/DMSO5 marks
- 2(a)(ii)7-Norbornyl and anti-7-norbornenyl tosylates: participation of a C=C5 marks
- 2(b)E2 in a locked trans-decalin and in locked 1,2-dibromocyclohexanes10 marks
- 2(c)(i)Bromolactonisation of endo-norbornene-carboxylic acid5 marks
- 2(c)(ii)Octalin to the tertiary and the secondary decalol5 marks
- 2(d)Aromatic character of sydnones10 marks
Question 3 40 marks
- 3(a)(i)Neopentyl iodide with aqueous silver nitrate: 1,2-methyl shift5 marks
- 3(a)(ii)An α-chloro ketone without α'-H: quasi-Favorskii rearrangement5 marks
- 3(b)(i)2-Pyrone + dienol: inverse-demand Diels–Alder, loss of CO₂ and water5 marks
- 3(b)(ii)trans-1,2-Divinylcyclohexanol: oxy-Cope ring expansion5 marks
- 3(c)(i)Correlation diagrams: butadiene and cyclobutene5 marks
- 3(c)(ii)Fused cyclobutenes: conrotatory opening allowed or blocked5 marks
- 3(d)(i)Dichloroketene [2+2], dechlorination, Baeyer–Villiger5 marks
- 3(d)(ii)Nitrile oxide from a nitro compound: intramolecular [3+2]5 marks
Question 4 40 marks
Question 5 40 marks
- 5(a)Monomers of Teflon and Bakelite; addition or condensation5 marks
- 5(b)Products of complete hydrolysis of DNA5 marks
- 5(c)3-Methylindene: OsO₄, HIO₄, then base5 marks
- 5(d)Photodecarbonylation of diphenylcyclopropenone5 marks
- 5(e)Chemical shift at 60 MHz and 100 MHz5 marks
- 5(f)λmax of CH₃Cl, CH₃Br, CH₃I: n→σ*5 marks
- 5(g)Bathochromic shift with increasing conjugation5 marks
- 5(h)McLafferty rearrangement: butyrophenone, m/z 120 and 1055 marks
Question 6 40 marks
Question 7 40 marks
Question 8 40 marks
- 8(a)(i)Cyclopentadiene + β-nitrostyrene; Nef reaction of the adduct10 marks
- 8(a)(ii)Photocyclisation of cyclodecanone to 9-decalol10 marks
- 8(a)(iii)Norrish type II reaction of 2-benzoylnorbornane10 marks
- 8(b)(i)Periodic acid cleavage of an aldohexose5 marks
- 8(b)(ii)Baeyer–Villiger oxidation of camphor5 marks
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Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.
Model answer pages open with any Mains test series.