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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper III

Q9(b)(i). Wittig alkene synthesis

Question

Complete ethyl chloride →(Ph₃P) →(NaH) →(cyclohexanone) product.

Answer in brief

Ethylidenecyclohexane forms, together with triphenylphosphine oxide.

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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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Read the whole 2017 solution2017 question paper

CoversWittig alkene synthesisPhosphorus ylides

All parts of Question 9