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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(b). Mass spectra of benzyl alcohol and anisole

Question

Distinguish benzyl alcohol and anisole by mass-spectral fragmentation.

Answer in brief

Both have M⁺• at m/z 108. Benzyl alcohol characteristically gives m/z 107 and 79; anisole gives prominent methoxy-cleavage/rearrangement ions such as m/z 93 and 78.

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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 spectrometry fragmentationbenzyl alcoholanisoletropylium ion m/z 91molecular ion m/z 108

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