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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

Q3(d). Regioselective ketone alkylation

Question

Identify thermodynamic A and kinetic B after base then MeI [from butan-2-one, as shown in the paper]; specify base, solvent, temperature and mechanism.

Answer in brief

A = 3-methylbutan-2-one; B = pentan-3-one.

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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: carbonyl additions and condensations, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverskinetic vs thermodynamic enolateLDAenolate alkylationbutan-2-one methylationregioselectivity

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