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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

Q8(c). Matching mass-spectral behaviour

Question

Match A scrambling, B M−18, C M/M+2 1:1, D retro-Diels–Alder and E McLafferty with the five printed structures I–V. [structures I–V given in the paper]

Answer in brief

A–V, B–IV, C–I, D–II, E–III.

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The full model answer

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

Coversmass spectrometryMcLafferty rearrangementretro-Diels–Alder fragmentationtropylium ionM+2 isotope peak

All parts of Question 8