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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2020 · Mains Paper III

Q10(d). Cyclohexanone mass fragmentation

Question

Account for cyclohexanone ions at m/z 98, 70, 83, 55 and 42.

Answer in brief

98 is the molecular radical cation; carbonyl loss and ring-cleavage/rearrangement pathways account for the lower ions.

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CoversCyclohexanone mass fragmentationElectron-impact mass spectrometry

All parts of Question 10