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 36 
Pages 3 and 4 of 36 
Pages 5 and 6 of 36 
Pages 7 and 8 of 36 
Pages 9 and 10 of 36
Pages 11 and 12 of 36 Pages 13 and 14 of 36 Pages 15 and 16 of 36 Pages 17 and 18 of 36 Pages 19 and 20 of 36 Pages 21 and 22 of 36 Pages 23 and 24 of 36 Pages 25 and 26 of 36 Pages 27 and 28 of 36 Pages 29 and 30 of 36 Pages 31 and 32 of 36 Pages 33 and 34 of 36 Pages 35 and 36 of 36
Paper II, organic chemistry and spectroscopy
Solution, 2023
Indian Forest Service (Mains), Chemistry optional. 36 pages. Questions 1, 2, 5, 6 and 7 are answered.
Every question of 2023, one page each53 parts in 8 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Aromaticity of heterocycles5 marks
- 1(b)Evidence for a tetrahedral intermediate5 marks
- 1(c)Benzyne capture by tetracyclone5 marks
- 1(d)Para-alkyl effects on benzyl solvolysis5 marks
- 1(e)Dehydrobromination through an ion pair5 marks
- 1(f)Why nucleophilic shifts are common5 marks
- 1(g)A double oxy-Cope rearrangement5 marks
- 1(h)Substituent effects in Cannizzaro reaction5 marks
Question 2 40 marks
Question 3 40 marks
- 3(a)Hydrogen bromide addition to a conjugated diene5 marks
- 3(b)(i)Nitration of p-bromoanisole3 marks
- 3(b)(ii)Nitration of p-chloroanisole2 marks
- 3(c)Solvolysis and antiaromatic destabilization5 marks
- 3(d)Racemization during alpha bromination5 marks
- 3(e)Self-condensation of diethyl succinate10 marks
- 3(f)Six-pi electrocyclic switching10 marks
Question 4 40 marks
- 4(a)Two electrophilic additions with unusual outcomes5 marks
- 4(b)Rates of alkoxide-induced elimination5 marks
- 4(c)Regioselective Diels–Alder addition5 marks
- 4(d)Knoevenagel condensation5 marks
- 4(e)Pinacol and Tiffeneau–Demjanov rearrangements5 marks
- 4(f)Buchner ring expansion5 marks
- 4(g)Two substrates, one Favorskii intermediate10 marks
Question 5 40 marks
- 5(a)Substituent effects on anionic propagation5 marks
- 5(b)Osmium dihydroxylation of an allylic alcohol5 marks
- 5(c)Photocyclization of isomesityl oxide5 marks
- 5(d)Woodward–Fieser calculation and a name error5 marks
- 5(e)Distinguishing ortho and para xylene5 marks
- 5(f)Chemical and magnetic equivalence in styrene5 marks
- 5(g)Parent ion from a metastable peak5 marks
- 5(h)Complementary DNA base pairs5 marks
Question 6 40 marks
Question 7 40 marks
- 7(a)Photochemistry of a rigid aryl ketone5 marks
- 7(b)Sequential anionic polymerization5 marks
- 7(c)Neoprene and chloroprene5 marks
- 7(d)Why polymers have average molar masses5 marks
- 7(e)Two unsaturated ester isomers5 marks
- 7(f)Sanger determination of the N terminus5 marks
- 7(g)Chemical-shift separation in Hz5 marks
- 7(h)Hydration of phenylacetylene5 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.
Model answer pages open with the VKC plan.