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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 · Q110 of 120

Geo-Scientist Prelims 2020 Chemistry Q110: The major product formed in the reaction of N,N-dimethylaniline…

QuestionOrganic / nitration of amines

The major product formed in the reaction of N,N-dimethylaniline with concentrated H₂SO₄/HNO₃ mixture is:

UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q110: answer options as printed
  1. (a) m-Nitro-N,N-dimethylaniline
  2. (b) p-Nitro-N,N-dimethylaniline
  3. (c) o-Nitro-N,N-dimethylaniline
  4. (d) 2,4-Dinitro-N,N-dimethylaniline

Answer: (a)

In conc. H₂SO₄/HNO₃ the NMe₂ group is protonated to −N⁺HMe₂, a strong meta-director (−I). Major product m-nitro-N,N-dimethylaniline → (a).

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