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Indian Forest Service (Mains)

Chemistry optional

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

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2024 · Paper II

Q8(c)(i). NMR distinction of two isomer pairs

Question

Distinguish (1) ethyl acetate and methyl propionate and (2) 2-nitroacetophenone and 4-nitroacetophenone by proton NMR.

Answer in brief

The ester pair differs in which group is attached to oxygen; the nitroacetophenone pair differs chiefly in aromatic symmetry and number of signals.

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Topic notes: ¹H and ¹³C NMR: chemical shift, spin–spin coupling and coupling constants, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversproton NMRethyl acetate vs methyl propionatenitroacetophenone isomersAA′BB′ patternchemical shift

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