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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 · Q119 of 120

Geo-Scientist Prelims 2026 Chemistry Q119: The major product formed in Reaction I and Reaction II are Reaction…

QuestionStereochemistry / neighbouring group participation vs SN2

The major product formed in Reaction I and Reaction II are Reaction I : (1R,2R)-2-bromocyclohexan-1-ol → (H⁺) Reaction II : (1S,2R)-2-bromocyclohexan-1-ol → (H⁺)

  1. (a) Reaction I : (1S,2S)-1,2-dibromocyclohexane; Reaction II : (1S,2S)-1,2-dibromocyclohexane
  2. (b) Reaction I : (1R,2S)-1,2-dibromocyclohexane; Reaction II : (1R,2S)-1,2-dibromocyclohexane
  3. (c) Reaction I : (1R,2R)-1,2-dibromocyclohexane; Reaction II : (1R,2S)-1,2-dibromocyclohexane
  4. (d) Reaction I : (1R,2R)-1,2-dibromocyclohexane; Reaction II : (1R,2R)-1,2-dibromocyclohexane

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