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AQA A Level Chemistry

Topic questions Organic chemistry Free-radical substitution

Free-radical substitution

6 questions · 23 marks · about 25 minutes

Free-radical substitution questions

TopicFree-radical substitution

AQA 7405 Free-radical substitution 6 questions

Paper 2 June 2025, Question 1 12 marks

This question is about different ways to make 1,2-dichlorobutane.

Figure for question 1
1.1

Give the name of the mechanism for reaction 1.

State one essential condition needed for reaction 1.

Name of mechanism

Essential condition

[2]
Reveal mark scheme Mark scheme for question 1.1
1.2

Give equations to show three essential steps in the mechanism for reaction 1.

[3]
Reveal mark scheme Mark scheme for question 1.2
1.3

Suggest two reasons why using reaction 1 is likely to give a low yield of 1,2-dichlorobutane.

[2]
Reveal mark scheme Mark scheme for question 1.3
1.4

Give a suitable reagent and conditions needed for reaction 2.

[2]
Reveal mark scheme Mark scheme for question 1.4
1.5

Identify the reagent and name the mechanism for reaction 3.

Name of mechanism

[2]
Reveal mark scheme Mark scheme for question 1.5
1.6

Use of the reagent for reaction 2 followed by the reagent for reaction 3 gives another organic product.

Give the structure of the other organic product.

[1]
Reveal mark scheme Mark scheme for question 1.6

Paper 3 June 2022, Question 22 1 mark

2-Bromopropane reacts with bromine to form 2,2-dibromopropane.

What is the name of the mechanism of this reaction?

Figure for question 22
[1]
Reveal mark scheme Mark scheme for question 22

Paper 2 November 2021, Question 9 7 marks

This question is about the ozone layer in the upper atmosphere.

9.1

State why the ozone layer is beneficial for living organisms.

[1]
Reveal mark scheme Mark scheme for question 9.1
9.2

State how chlorofluorocarbons (CFCs) form chlorine atoms in the upper atmosphere.

[1]
Reveal mark scheme Mark scheme for question 9.2
9.3

Give equations to show how chlorine atoms catalyse the decomposition of ozone.

[2]
Reveal mark scheme Mark scheme for question 9.3
9.4

Hydrochlorofluorocarbons (HCFCs) have been used in place of CFCs. In the mechanism to make an HCFC from a fluoroalkane, two incomplete steps are shown.

Complete each step in the mechanism.

Give the name of the type of step shown by both these equations.

Question 9, shown as an image
Question 9, shown as an image
[3]
Reveal mark scheme Mark scheme for question 9.4

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Do the mole calculation
Write ‘exothermic’ and pray
Me on the 6-marker about electrolysis
Knowing water is H₂O
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Getting two concordant titres
Realising nobody actually knows what a mole is
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