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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 · 2022 · Paper II

Q5(f). Relative carbonyl stretching frequencies

Question

Arrange the five supplied compounds I–V in increasing order of carbonyl stretching frequency. [structures I–V given in the paper]

Answer in brief

The expected qualitative sequence is I < IV < V < II < III.

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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: IR spectroscopy: group frequencies, carbonyl stretching and hydrogen bonding, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverscarbonyl stretching frequencyIR spectroscopytroponeconjugation effectring strain

All parts of Question 5