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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 · Q110 of 120

Geo-Scientist Prelims 2023 Chemistry Q110: The products [A] and [B] formed in the following reaction sequence…

QuestionOrganic / halohydrin formation and dehydration

The products [A] and [B] formed in the following reaction sequence are :

UPSC Combined Geo-Scientist Prelims 2023 Paper II (Chemistry), Q110: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2023 Paper II (Chemistry), Q110: answer options as printed
  1. (a) [A] = bromohydrin with OH on C3 and Br on C2 (tertiary); [B] = pinocamphone-type ketone
  2. (b) [A] = bromohydrin with OH on C3 and Br on C2 (tertiary); [B] = allylic bromide with C3=C4 double bond
  3. (c) [A] = bromohydrin with Br on C3 and OH on C2 (tertiary); [B] = vinyl bromide with C2=C3 double bond (endocyclic)
  4. (d) [A] = bromohydrin with Br on C3 and OH on C2 (tertiary); [B] = allylic bromide with exocyclic C=CH₂

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