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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 · Q105 of 120

Geo-Scientist Prelims 2020 Chemistry Q105: The major product formed in the following reaction is:

QuestionOrganic / Hofmann elimination

The major product formed in the following reaction is:

UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q105: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q105: answer options as printed
  1. (a) CH₃CH=CH₂
  2. (b) CH₃CH=CHCH₃
  3. (c) CH₃CH₂CH=CH₂
  4. (d) H₂C=CH₂

Answer: (d)

Quaternary ammonium hydroxide on heating gives the Hofmann product (least substituted alkene) — OH⁻ removes the most accessible, most acidic β-H. Here the ethyl group gives ethene, H₂C=CH₂ → (d).

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