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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper I

Q9(a)(ii). Alkene hydrogenation by Wilkinson’s catalyst

Question

Explain the mechanism for hydrogenation of alkene by the Wilkinson's catalyst.

Answer in brief

PPh₃ dissociation → H₂ oxidative addition → alkene coordination → hydride migration → reductive elimination regenerates the Rh(I) catalyst.

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Topic notes: organometallics: 18-electron rule, oxidative addition, fluxional molecules and Wilkinson's catalyst, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversWilkinson's catalystalkene hydrogenationcatalytic cycleoxidative additionmigratory insertionreductive elimination

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