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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 · Q96 of 120

Geo-Scientist Prelims 2026 Chemistry Q96: The major products [X] and [Y] formed in the following reactions are

QuestionOrganic / stereochemistry of E2

The major products [X] and [Y] formed in the following reactions are

UPSC Combined Geo-Scientist Prelims 2026 Paper II (Chemistry), Q96: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2026 Paper II (Chemistry), Q96: answer options as printed
  1. (a) [X] = alkene with Ph and Et cis (Ph, Me on one carbon; Et, Me on the other); [Y] = 1,3-dideuterio-cyclohexene (one D on the double bond, one allylic) and its enantiomer
  2. (b) [X] = alkene with Ph and Me cis (Ph, Me on one carbon; Me, Et on the other); [Y] = 3-deuteriocyclohexene and its enantiomer
  3. (c) [X] = alkene with Ph and Et cis; [Y] = 3-deuteriocyclohexene (allylic D) and its enantiomer
  4. (d) [X] = alkene with Ph and Me cis; [Y] = 1,3-dideuterio-cyclohexene (one D on the double bond, one allylic) and its enantiomer

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