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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 · 2024 · Paper II

Q8(a)(i). Axial versus equatorial alpha chlorine

Question

Distinguish the drawn α-chloro bicyclic ketones X and Y by IR; X has axial Cl and Y equatorial Cl. [structures given in the paper]

Answer in brief

Y normally has the higher carbonyl stretching frequency; axial-Cl X shows a smaller upward shift from the parent ketone.

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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: stereochemistry and conformational analysis (R/S, E/Z, Fischer and Newman projections, cyclohexane chair), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversα-haloketone ruleIR carbonyl frequencyaxial vs equatorial chlorinefield effectconformational analysis

All parts of Question 8