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CAIE IGCSE Chemistry Organic Substitution Definition

Practise recognising substitution when one atom or group is replaced by another and applying the term to halogen reactions of saturated hydrocarbons.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • define substitution as replacement of one atom or group by another atom or group
  • identify alkane halogenation as substitution when hydrogen is replaced by a halogen
  • distinguish substitution products from addition, where atoms add across a double bond

11.4.3—In a substitution reaction one atom or question 1

[Maximum number: 1]

The table shows the structures of four hydrocarbons.

Table for Question 11.4.3—In a substitution reaction one atom or question 1 — CAIE IGCSE Chemistry

Compound P undergoes a substitution reaction with chlorine.

What is meant by the term substitution reaction?

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