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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper III

Q10(c). Benzyne generation and trapping

Question

Anthranilic acid is treated with NaNO₂/HCl at 0°C, then heated in the presence of the depicted benzofuran. Identify intermediates and products.

Answer in brief

Diazotisation gives benzene-2-diazonium carboxylate; heating produces benzyne. With benzofuran, mono- and bis-adduct formation must be distinguished.

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CoversBenzyne generationtrappingAryne chemistry

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