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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

Indian Forest Service (Mains), Chemistry optional · 2021 · Paper II

Q5(g). Acidity of cyclopentadiene derivatives

Question

Arrange cyclopentadiene, pentakis(trifluoromethyl)cyclopentadiene, indene and fluorene in increasing acidity.

Answer in brief

Fluorene < indene < cyclopentadiene < pentakis(trifluoromethyl)cyclopentadiene.

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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 2021 solution2021 question paper

Topic notes: aromaticity (Hückel rule, antiaromaticity, annulenes, azulene, tropolone, fulvene, sydnones), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverscyclopentadienyl anionacidity of hydrocarbonsaromatic stabilizationindenefluorene

All parts of Question 5