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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 · 2023 · Paper II

Q5(g). Parent ion from a metastable peak

Question

Given m/z values 106, P, 65, 46.42, 29 and 15, find parent P for daughter 65.

Answer in brief

P is approximately m/z 91, taking 46.42 as the metastable peak.

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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: mass spectrometry: molecular ion, metastable peak and McLafferty rearrangement, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversmetastable peakmass spectrometrym* = m₂²/m₁tropylium ionfragmentation

All parts of Question 5