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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)(ii). Structure from an aldol-condensation spectrum

Question

Identify the benzaldehyde/acetone base-condensation product with ¹H NMR δ 2.31 (s, 3H), 6.73 (d, 1H, J = 16 Hz), 7.32–7.40 (m, 5H), 7.52 (d, 1H, J = 16 Hz).

Answer in brief

The product is (E)-4-phenylbut-3-en-2-one, benzylideneacetone: PhCH=CHCOCH₃.

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CoversbenzylideneacetoneClaisen-Schmidt condensationtrans coupling constant 16 Hzproton NMR structure elucidationaldol condensation

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