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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 · Q85 of 120

Geo-Scientist Prelims 2025 Chemistry Q85: Rank the indicated C – H bonds in the following compound in order…

QuestionOrganic / free-radical halogenation

Rank the indicated C – H bonds in the following compound in order of increasing ease of H-abstraction in a radical halogenation reaction and select the correct answer accordingly :

UPSC Combined Geo-Scientist Prelims 2025 Paper II (Chemistry), Q85: figure printed with the question
  1. (a) 4 < 3 < 2 < 1
  2. (b) 2 < 1 < 3 < 4
  3. (c) 3 < 4 < 1 < 2
  4. (d) 4 < 3 < 1 < 2

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