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IB Chemistry SL 3.3 Electron Sharing Reactions Radicals Questions

Practise IB Chemistry SL 3.3 with questions on radical notation, homolytic fission and initiation, propagation and termination in substitution.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Recognize radical species and explain homolytic fission with single-barbed arrows and initiation conditions.
  • Write propagation and termination equations for alkane–halogen substitution, tracking radical intermediates.

Covered syllabus points

3.3.1—Radicals3.3.2—Homolytic fission3.3.3—Radical substitution

Learn this topic

Study 3.3 Electron sharing reactions (Radicals) conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

Antioxidants are a type of food additive.

Antioxidants such as BHT and 3-BHA prevent the unwanted reactions of free radicals. State what a free radical is.

Question 2

[Maximum number: 2]

Alkenes, such as A (shown below), are important intermediates in the petrochemical industry because they undergo addition reactions to produce a wide variety of products, such as the conversion shown below.

Figure for Question 2 — IB Chemistry SL

Question (a)

(a)

Another way to make B is the reaction shown below.

Figure for Question (a) — IB Chemistry SL
[ 2 ]

Question (i)

(i)

State the conditions required for this reaction to occur.

[ 1 ]

Question (ii)

(ii)

Outline why it would give a poor yield of the desired product.

[ 1 ]

Question 3

[Maximum number: 1]

Chlorine undergoes many reactions.

State the type of reaction occurring when ethane reacts with chlorine to produce chloroethane.

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