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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

Q12(b). Alkyne ether identification

Question

C₄H₆O has no significant UV band, IR 3300–2900 and 2200 cm⁻¹, and three ¹H singlets at 3.0 (1H), 3.5 (3H), 4.9 (2H). Propose a structure.

Answer in brief

Propargyl methyl ether, HC#CCH₂OCH₃, best matches the functional-group and integration pattern.

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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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CoversAlkyne ether identificationStructure elucidation

All parts of Question 12