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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 · 2016 · Mains Paper II

Q9(a). Nuclear spin–spin coupling

Question

Explain nuclear spin–spin coupling using the ¹ H NMR spectrum of CHBr₂CHO, including how the coupling arises.

Answer in brief

The methine and aldehydic protons are inequivalent and mutually split one another into two 1:1 doublets under first-order conditions.

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CoversNuclear spin–spin couplingProton NMR

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