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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2025 · Paper II

Q4(c)(ii). 1,2 versus 1,4 addition

Question

Choose reagents converting methyl vinyl ketone to (1) the tertiary allylic alcohol shown and (2) pentan-2-one. [structure of the allylic alcohol given in the paper]

Answer in brief

(1) MeMgBr or MeLi, then aqueous work-up; (2) Me₂CuLi, then aqueous work-up.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: addition to alkenes and alkynes (Markovnikov, stereochemistry, dienes), with every Civil Services, IFoS and Geo-Scientist PYQ →

Covers1,2 vs 1,4 additionGilman reagent Me₂CuLiGrignard reagentconjugate additionmethyl vinyl ketone

All parts of Question 4