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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

Q5(f). Nitration of indole

Question

Can indole be nitrated with concentrated HNO₃/H₂SO₄? If not, give an appropriate nitration reaction and example.

Answer in brief

The strongly acidic oxidizing mixture is unsuitable for clean indole nitration; benzoyl nitrate gives a 3-nitro derivative, although side reactions can lower the yield.

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Topic notes: aromatic substitution (electrophilic, nucleophilic) and heterocycles, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversnitration of indolebenzoyl nitrateelectrophilic substitution at C3acid sensitivity of indole3-nitroindole

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