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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 · 2019 · Mains Paper II

Q9(b). NMR of aromatic isomers

Question

How can proton NMR distinguish p-xylene and ethylbenzene?

Answer in brief

p-Xylene has a 6H methyl singlet; ethylbenzene has a 3H methyl triplet and 2H benzylic quartet.

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CoversNMR of aromatic isomersNMR spectroscopy

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