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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 · 2021 · Paper II, Chemistry · Q104 of 120

Geo-Scientist Prelims 2021 Chemistry Q104: Which isomer of 1,2,3,4,5,6-hexachlorocyclohexane shown below…

QuestionElimination / E2 stereochemistry

Which isomer of 1,2,3,4,5,6-hexachlorocyclohexane shown below undergoes E2 elimination (dehydrohalogenation) most slowly?

UPSC Combined Geo-Scientist Prelims 2021 Paper II (Chemistry), Q104: answer options as printed
  1. (a) Cl wedge/wedge/wedge/hash/wedge/hash around the ring
  2. (b) All six Cl on wedges (all-cis)
  3. (c) Cl alternating wedge/hash around the ring (all-trans, β-isomer)
  4. (d) Three adjacent Cl on wedges and three adjacent on hashes

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