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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2021 · Paper II

Q8(b). Identification of an aromatic diester

Question

Identify C₁₂H₁₄O₄: UV 225, 265 nm; IR 2900, 2800, 1720, 1030, 860 cm⁻¹; ¹H NMR 1.48 (6H, t, J = 7 Hz), 4.4 (4H, q, J = 7 Hz), 8.1 (4H, s); MS 222, 194, 177 (base peak), 149.

Model answer

The free solution for 2021 answers questions 1, 2, 3, 5 and 6, 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: structure from combined IR, NMR and mass spectra, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversstructure elucidationdiethyl terephthalate¹H NMRmass spectrometry fragmentationIR ester band

All parts of Question 8