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Topic

Isomerism

Asked 2 times across 2 UPSC exams over 5 years (2019–2024), peaking in 2019.
2
PYQs
2
Exams
2
Years active
2019–2024
Span
2019
Peak
2/2
Answers
📅 Full chronological timeline →

Key insights

  • Most tested in CDS — 1 of 2 PYQs
  • Most asked in 2019
  • Recurs across 2 years (2019–2024)

How it travelled across exams

First appearance in each exam — the same idea, reframed.
CDS 2019 GEO 2024

How the concept evolved

119
124
Rising — more than half its appearances (2 of 2) are since 2016.

Sample questions

You've seen the pattern — here are a few of the actual PYQs.
GEO2024
Which one of the following types of isomerisms is shown by [CoCl2(en)2]Cl ?
  1. A Optical isomerism only
  2. B Geometrical isomerism only
  3. C Both ionisation and geometrical isomerisms
  4. D Both geometrical and optical isomerisms ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
CDS2019
In which of the following, functional group isomerism is not possible?
  1. A Alcohols
  2. B Aldehydes
  3. C Alkyl halides ✓
  4. D Cyanides
✓ Correct answer: (C)
Science & Technology › Physics & Chemistry

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