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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(a). Electrocyclic stereochemistry

Question

Predict thermal and photochemical ring-closure products of the depicted (E,Z)-hexa-2,4-diene.

Answer in brief

Thermal closure gives cis-3,4-dimethylcyclobutene; photochemical closure gives the trans isomer.

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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

CoversElectrocyclic stereochemistryPericyclic reactions

All parts of Question 10