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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 · Q115 of 120

Geo-Scientist Prelims 2020 Chemistry Q115: The major product formed in the following reaction is:

QuestionOrganic / secondary amines with HNO₂

The major product formed in the following reaction is:

UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q115: figure printed with the question
UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q115: answer options as printed
  1. (a) o-Nitro-N-methylaniline
  2. (b) o-Nitroso-N-methylaniline
  3. (c) 2,4-Dinitro-N-methylaniline
  4. (d) N-Nitroso-N-methylaniline

Answer: (d)

Secondary amines react with HNO₂ (NaNO₂/HCl) to give N-nitrosoamines (yellow oil): C₆H₅N(CH₃)–N=O → (d). (Liebermann nitroso test.)

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