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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 · 2026 · Paper II, Chemistry · Q115 of 120

Geo-Scientist Prelims 2026 Chemistry Q115: Which one of the following 1,2-diols is the least reactive for acid…

QuestionOrganic / pinacol rearrangement

Which one of the following 1,2-diols is the least reactive for acid catalyzed pinacol-pinacolone rearrangement ?

UPSC Combined Geo-Scientist Prelims 2026 Paper II (Chemistry), Q115: answer options as printed
  1. (a) 2-Phenylbutane-2,3-diol, PhC(CH₃)(OH)–CH(OH)CH₃
  2. (b) F₃C(Ph)C(OH)–C(OH)(CF₃)CH₃
  3. (c) 2-Phenylpropane-1,2-diol, PhC(CH₃)(OH)–CH₂OH
  4. (d) 1,2-Diphenylcyclobutane-1,2-diol

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