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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 · 2017 · Mains Paper II

Q12(c). Ethanol proton NMR

Question

What does peak area indicate in a PMR spectrum? How many peaks are observed for pure ethanol and what is their area ratio? Explain with a diagram if possible.

Answer in brief

Ethanol has three proton environments with integrated areas CH₃:CH₂:OH=3:2:1. Commonly these appear as a triplet, quartet and exchange-broadened singlet.

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CoversEthanol proton NMRNMR spectroscopy

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