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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 · 2024 · Paper II, Chemistry · Q104 of 120

Geo-Scientist Prelims 2024 Chemistry Q104: Consider the following statements :

QuestionFree-radical addition / peroxide (Kharasch) effect

Consider the following statements :

  1. Statement–1 : The peroxide effect is observed for the addition of HBr to alkene but not for the addition of HCl or HI.
  2. Statement–2 : Either of the two propagation steps for the addition of HCl or HI to alkene is endothermic in nature.

Which one of the following is correct with respect to the above statements?

  1. (a) Both Statement–1 and Statement–2 are correct and Statement–2 is the correct explanation of Statement–1
  2. (b) Both Statement–1 and Statement–2 are correct and Statement–2 is not the correct explanation of Statement–1
  3. (c) Statement–1 is correct but Statement–2 is incorrect
  4. (d) Statement–1 is incorrect but Statement–2 is correct

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