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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 · 2020 · Mains Paper III

Q10(c). Chemoselective epoxidation

Question

Predict separately the products of the depicted isopropenyl-substituted cyclohexenecarboxylate with (i) RCO₃H and (ii) alkaline H₂O₂. Explain.

Answer in brief

Peracid preferentially epoxidises the isolated isopropenyl group; alkaline peroxide targets the ester-conjugated ring C=C.

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CoversChemoselective epoxidationElectrophilic and nucleophilic oxidants

All parts of Question 10