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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

Q4(c)(i). Benzoin exchange in cyanide

Question

Give products and mechanism when benzoin and p-anisaldehyde are heated with KCN.

Answer in brief

Cyanide permits retro-benzoin cleavage and crossed benzoin formation; with Ar = p-MeOC₆H₄, the crossed products are PhCOCH(OH)Ar and ArCOCH(OH)Ph.

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Topic notes: carbonyl additions and condensations, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversbenzoin condensationcrossed benzoinretro-benzoinumpolungcyanide catalysis

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