VKC ScienceChemistry for written exams Telegram

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 · 2023 · Mains Paper III

Q10(c). Cope rearrangement of cis-2,3-divinyloxirane

Question

Identify the product Y for the thermal sigmatropic reaction of X (Δ). Name the reaction and give suitable mechanism. [Structure of X given in the paper]

Answer in brief

Cope rearrangement ([3,3]-sigmatropic shift). Y = 4,5-dihydrooxepine, C₆H₈O.

Part of VKC Basic

Read the key points and the full model answer with VKC Basic

VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.

See what is included Already a member? Sign in

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.

The handwritten model answer pages open with the VKC plan.
Read the whole 2023 solution2023 question paper

Topic notes: pericyclic reactions, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversCope rearrangement[3,3]-sigmatropic shiftdivinyloxiranedihydrooxepineboat transition state

All parts of Question 10