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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 · 2025 · Paper II, Chemistry · Q98 of 120

Geo-Scientist Prelims 2025 Chemistry Q98: The precursors [X] and [Y] in the following transformations are :

QuestionStereochemistry / stereospecific additions to alkenes

The precursors [X] and [Y] in the following transformations are :

UPSC Combined Geo-Scientist Prelims 2025 Paper II (Chemistry), Q98: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2025 Paper II (Chemistry), Q98: answer options as printed
  1. (a) [X] = cis-cyclodecene; [Y] = cis-cyclooctene
  2. (b) [X] = trans-cyclodecene; [Y] = cis-cyclooctene
  3. (c) [X] = trans-cyclodecene; [Y] = trans-cyclooctene
  4. (d) [X] = cis-cyclodecene; [Y] = trans-cyclooctene

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Topic notes: addition to alkenes and alkynes (Markovnikov, stereochemistry, dienes), with every Civil Services, IFoS and Geo-Scientist PYQ →

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