UPSC Civil Services (Mains), Chemistry optional · 2025 · Paper II
Q3(b)(ii). Structures of C and D
Question
Elucidate the structure of C and D in the following conversion: C (C₈H₁₂) with 1) O₃, 2) HOAc gives a single diacid [structure given in the paper]; C with H₂/Pt gives D (C₈H₁₆).
Answer in brief
C = cyclooctyne; D = cyclooctane.
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Coverscyclooctyneozonolysissuberic aciddegree of unsaturationcatalytic hydrogenation
All parts of Question 3
- 3(a)(i) Products of two reactions10 marks
- 3(a)(ii) Ketone A from isobutanol alone5 marks
- 3(b)(i) Cyclopropane from tert-butyl chloroacetate and ethyl acrylate10 marks
- 3(b)(ii) Structures of C and D5 marks
- 3(c)(i) Missing reagents and intermediate10 marks
- 3(c)(ii) Photolysis of the α-diazoketone in methanol10 marks