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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 · 2022 · Paper II, Chemistry · Q102 of 120

Geo-Scientist Prelims 2022 Chemistry Q102: The precursor [X] in the following reaction is

QuestionCarbonyl chemistry / intramolecular Michael addition

The precursor [X] in the following reaction is

UPSC Combined Geo-Scientist Prelims 2022 Paper II (Chemistry), Q102: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2022 Paper II (Chemistry), Q102: answer options as printed
  1. (a) Methyl 3-oxo-4-(3-oxocyclohex-1-en-1-yl)butanoate (side chain on the β-carbon of the enone)
  2. (b) Methyl 3-oxo-4-(4-oxocyclohex-2-en-1-yl)butanoate (side chain on the γ-carbon of the enone)
  3. (c) Methyl 3-oxo-4-(5-oxocyclohex-3-en-1-yl)butanoate (side chain meta to C=O)
  4. (d) Methyl 3-oxo-4-(5-oxocyclohex-1-en-1-yl)butanoate (ring C=C not conjugated with the C=O)

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