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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper II

Q12(c). Trinitrobenzene proton spectra

Question

Distinguish 1,3,5-trinitrobenzene and 1,2,4-trinitrobenzene using their proton NMR spectra. Sketch each low-resolution spectrum.

Answer in brief

The 1,3,5-isomer gives one aromatic signal of area 3H; the 1,2,4-isomer gives three inequivalent aromatic signals of equal 1H area.

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CoversTrinitrobenzene proton spectraNMR spectroscopy

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