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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)(ii). Reformatsky reaction

Question

Complete benzaldehyde with BrCH₂CO₂Et/Zn, followed by aqueous acid and heat.

Answer in brief

The beta-hydroxy ester forms first; dehydration gives predominantly ethyl (E)-cinnamate.

Part of VKC Basic

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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

CoversReformatsky reactionCarbon–carbon bond formation

All parts of Question 9