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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 · 2025 · Paper II, Chemistry · Q81 of 120

Geo-Scientist Prelims 2025 Chemistry Q81: Which one of the following represents the correct increasing order…

QuestionOrganic / electrophilic addition to alkenes

Which one of the following represents the correct increasing order of reactivity among indicated compounds towards electrophilic reagents ?

  1. (a) CH₂ = CHNO₂ < CH₂ = CHN⁺(CH₃)₃ < CH₂ = CH₂ < CH₂ = CHCH₃ < CH₂ = CHBr < CH₂ = CHOCH₃
  2. (b) CH₂ = CHN⁺(CH₃)₃ < CH₂ = CHNO₂ < CH₂ = CH₂ < CH₂ = CHBr < CH₂ = CHCH₃ < CH₂ = CHOCH₃
  3. (c) CH₂ = CHNO₂ < CH₂ = CHN⁺(CH₃)₃ < CH₂ = CHBr < CH₂ = CH₂ < CH₂ = CHCH₃ < CH₂ = CHOCH₃
  4. (d) CH₂ = CHN⁺(CH₃)₃ < CH₂ = CHNO₂ < CH₂ = CHBr < CH₂ = CH₂ < CH₂ = CHOCH₃ < CH₂ = CHCH₃

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