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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 · 2023 · Paper II, Chemistry · Q96 of 120

Geo-Scientist Prelims 2023 Chemistry Q96: The product formed in the following reaction is :

QuestionStereochemistry / SN2 inversion

The product formed in the following reaction is :

UPSC Combined Geo-Scientist Prelims 2023 Paper II (Chemistry), Q96: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2023 Paper II (Chemistry), Q96: answer options as printed
  1. (a) Fischer projection (CH₃ top, C₂H₅ bottom): C2 HO left, H right; C3 H left, CH₃ right — (2R,3R)-3-methylpentan-2-ol
  2. (b) Fischer projection: C2 H left, OH right; C3 H left, CH₃ right — (2S,3R)-3-methylpentan-2-ol
  3. (c) Fischer projection: C2 H left, OH right; C3 H₃C left, H right — (2S,3S)-3-methylpentan-2-ol
  4. (d) Fischer projection: C2 HO left, H right; C3 H₃C left, H right — (2R,3S)-3-methylpentan-2-ol

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