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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 · Q107 of 120

Geo-Scientist Prelims 2025 Chemistry Q107: The major product formed in the following reaction sequence is :

QuestionOrganic / boronate (Marshall) fragmentation

The major product formed in the following reaction sequence is :

UPSC Combined Geo-Scientist Prelims 2025 Paper II (Chemistry), Q107: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2025 Paper II (Chemistry), Q107: answer options as printed
  1. (a) trans-Decalin alcohol with OH β (wedge) at the former alkene carbon, OSO₂Me retained
  2. (b) trans-Decalin alcohol with OH α (hash) at the former alkene carbon, OSO₂Me retained
  3. (c) (E,E)-1,6-cyclodecadiene with one Me on a ring alkene carbon and a gem-dimethyl group
  4. (d) (E,Z)-1,6-cyclodecadiene with one Me on a ring alkene carbon and a gem-dimethyl group

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