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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 · 2016 · Mains Paper III

Q10(b). Aromatic ammonium ylide

Question

Predict the initial product when 1-(trialkylammonio)indene, bearing H at C1, is treated with hydroxide.

Answer in brief

Deprotonation at C1 gives an indenyl-stabilised ammonium ylide.

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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 2016 solution2016 question paper

CoversAromatic ammonium ylideReactive intermediates

All parts of Question 10