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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2024 · Paper II, Chemistry · Q98 of 120

Geo-Scientist Prelims 2024 Chemistry Q98: In which one of the following elimination reactions, deuterium is…

QuestionElimination / stereochemistry of E2 and Ei

In which one of the following elimination reactions, deuterium is not retained in the alkene formed as the major product?

UPSC Combined Geo-Scientist Prelims 2024 Paper II (Chemistry), Q98: answer options as printed
  1. (a) trans-decalyl bromide with adjacent D (cis to Br), NaOEt/EtOH
  2. (b) exo-2-norbornyl chloride with D at C-3, KOBuᵗ/t-BuOH
  3. (c) PhCH(OAc)–CHDPh acetate, heat
  4. (d) PhCHD–CH₂Br, KOEt/EtOH

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