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CAIE IGCSE Chemistry Structural Isomerism

Practise defining structural isomers and drawing distinct arrangements with the same molecular formula while preserving valencies and functional groups.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • define structural isomers as compounds with the same molecular formula but different structures
  • verify an isomer pair by matching every atom count before comparing structural formulae
  • draw a different valid carbon skeleton or functional arrangement without changing the formula

11.1.8—Structural isomers as compounds with question 1

[Maximum number: 1]

Five organic compounds have the following structures.
A
C
C
A
,

Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry

B
B

Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry
Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry
Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry

D

Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry

E

Figure for Question 11.1.8—Structural isomers as compounds with question 1 — CAIE IGCSE Chemistry

Which two compounds are structural isomers of each other?

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