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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(d). Carbonyl electronic transitions

Question

Distinguish n→π* and π→π* transitions of a carbonyl compound, including the effect of increasing solvent polarity.

Answer in brief

n→π* is generally weaker and at longer wavelength; π→π* is stronger and at shorter wavelength. Polar solvents commonly shift the former blue and the latter red.

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CoversCarbonyl electronic transitionsUV spectroscopy

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