Indian Forest Service (Mains), Chemistry optional · 2023 · Paper II

Q8(c). Benzene radical anion

5 marks
Topic: Principles of spectroscopy and applications in structure elucidation
Question only

Question

For benzene treated with an alkali metal in THF, identify the product, suitable spectroscopy, total spin, line number and intensities.

Model answer

The free solution for 2023 answers questions 1, 2, 5, 6 and 7, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Topic notes: ESR spectroscopy, the g-value, hyperfine splitting and spin labels, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversbenzene radical anionESR spectroscopyhyperfine splitting2nI + 1 rulealkali metal reduction

All parts of Question 8

8(a) Selective epoxidation and carbonyl rearrangement10 marks
8(b) A C9H12 alkylbenzene mass spectrum5 marks
8(c) Benzene radical anion5 marks
8(d) Average repeat-unit mass of a terpolymer5 marks
8(e) Identification of glutaric anhydride15 marks