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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 · Q101 of 120

Geo-Scientist Prelims 2026 Chemistry Q101: A potential energy diagram is shown below for the E1 mechanism of…

QuestionOrganic / Hammond postulate

A potential energy diagram is shown below for the E1 mechanism of indicated reaction

UPSC Combined Geo-Scientist Prelims 2026 Paper II (Chemistry), Q101: figure printed with the question

By applying Hammond’s postulate to the potential energy diagram for this reaction, which one of the following statements is correct ?

  1. (a) The structure of transition state 2 is more carbocation-like than transition state 4
  2. (b) The structure of transition state 2 is less carbocation-like than transition state 4
  3. (c) The structure of transition state 2 resembles 1 more than it resembles 3
  4. (d) The structure of transition state 4 resembles 5 more than it resembles 3

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