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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 · 2020 · Paper II, Chemistry · Q109 of 120

Geo-Scientist Prelims 2020 Chemistry Q109: The major product formed in the following reaction is:

QuestionOrganic / alkyne hydration

The major product formed in the following reaction is:

UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q109: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q109: answer options as printed
  1. (a) Vinyl sulfonic acid (trans)
  2. (b) Vinyl sulfonic acid (cis)
  3. (c) PhCOCH₂Ph (deoxybenzoin)
  4. (d) PhCOCOPh (benzil)

Answer: (c)

Hg²⁺/H₂SO₄ hydration of an alkyne gives an enol → ketone (tautomerism). Diphenylacetylene → PhCOCH₂Ph (deoxybenzoin) → (c).

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