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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 · 2023 · Paper II, Chemistry · Q111 of 120

Geo-Scientist Prelims 2023 Chemistry Q111: Which one of the following is the correct sequence for synthesis of…

QuestionOrganic / synthesis and directing effects

Which one of the following is the correct sequence for synthesis of 1-bromo-3-(trichloromethyl)benzene ?

  1. (a) Reaction of toluene with Br₂ and Fe, then treating with Cl₂ in presence of hν or heat
  2. (b) Reaction of toluene with Cl₂ and Fe, then treating with Br₂ in presence of hν or heat
  3. (c) Reaction of toluene with Cl₂ in presence of hν or heat, then treating with Br₂ and Fe
  4. (d) Reaction of trichloromethyl benzene with Cl₂ in presence of hν or heat

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