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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 · 2025 · Paper II

Q4(d). Pyrrole with chloroform and base

Question

Give products and mechanisms when pyrrole reacts with chloroform in aqueous base.

Answer in brief

The products are pyrrole-2-carbaldehyde and ring-expanded 3-chloropyridine.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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

CoversReimer–Tiemann reactionCiamician–Dennstedt rearrangementdichlorocarbenepyrrole-2-carbaldehyde3-chloropyridine

All parts of Question 4