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*Jun25 7405201* IB/M/Jun25/G4007/V7 7405/2
For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL
Monday 16 June 2025 Morning Time allowed: 2 hours
Materials
For this paper you must have:
• the Periodic Table/Data Booklet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate.
Instructions • Use black ink or black ball-point pen.• Fill in the boxes at the top of this page.• Answer all questions.• You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages.• If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s).• All working must be shown.• Do all rough work in this book. Cross through any work you do not want to be marked.
Information • The marks for questions are shown in brackets.• The maximum mark for this paper is 105.
Please write clearly in block capitals.Centre number
Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.A-level
CHEMISTRY
Paper 2 Organic and Physical Chemistry 1 / 4
2
*02* IB/M/Jun25/7405/2
Do not write outside the box Answer all questions in the spaces provided.
- 1
This question is about different ways to make 1,2-dichlorobutane.
- 1
. 1 Give the name of the mechanism for reaction 1.
State one essential condition needed for reaction 1.[2 marks]
Name of mechanism
Essential condition
- 1
. 2 Give equations to show three essential steps in the mechanism for reaction 1.[3 marks]
- / 4
3
*03* Turn over ►
IB/M/Jun25/7405/2
Do not write outside the box
12
- 1
. 3 Suggest two reasons why using reaction 1 is likely to give a low yield of 1,2-dichlorobutane.[2 marks]
Reason 1
Reason 2
- 1
. 4 Give a suitable reagent and conditions needed for reaction 2.[2 marks]
Reagent
Conditions
- 1
. 5 Identify the reagent and name the mechanism for reaction 3.[2 marks]
Reagent
Name of mechanism
- 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 mark]
- / 4
4
*04* IB/M/Jun25/7405/2
Do not write outside the box
- 2
This question is about isomerism.
Compound L has this structure.
- 2
. 1 Use IUPAC rules to name L.
Explain why L exists as stereoisomers.[3 marks]
Name
Explanation
- 2
. 2 Compound M has the same carbon chain as L but the double bond is in a different position.
M also exists as stereoisomers.
Draw the structural formula of M.
Explain why M exists as stereoisomers.[2 marks]
Structural formula
Explanation
- / 4
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