2025 AQA AS CHEMISTRY Paper 2 Organic and Physical
Chemistry Question Paper & Mark Scheme (Merged) Tuesday
20 May 2025 [VERIFIED]
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 20 May 2025 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
the Periodic Table/Data Sheet, provided as an insert (enclosed) For Examiner’s Use
a ruler with millimetre measurements Question Mark
a scientific calculator, which you are expected to use where appropriate.
1
Instructions 2
Use black ink or black ball-point pen. 3
Fill in the boxes at the top of this page. 4
Answer all questions.
5
You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 6
If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s).
Section B
All working must be shown.
Do all rough work in this book. Cross through any work you do not TOTAL
want to be marked.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 80.
Advice
You are advised to spend 65 minutes on Section A and 25 minutes on Section B.
IB/M/Jun25/G4002/V7 7404/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about halogenoalkanes.
0 1 . 1 Halogenoalkanes undergo substitution reactions with nucleophiles such as
CN–, NH3 and OH–
Explain why halogenoalkanes react with nucleophiles.
[2 marks]
0 1 . 2 2-Bromobutane reacts with ammonia to form CH3CH(NH2)CH2CH3
Complete the mechanism for this reaction.
[3 marks]
2-Bromobutane reacts with KOH to give a mixture of products.
0 1 . 3 Identify the solvent that should be used to ensure that butan-2-ol is the
main organic product when 2-brombutane reacts with KOH
[1 mark]
IB/M/Jun25/7404/2
, 3
Do not write
outside the
box
0 1 . 4 Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene and
two other alkenes.
Name and complete the mechanism to form but-1-ene from 2-bromobutane.
Identify the other two alkenes formed.
[5 marks]
Name of mechanism
Mechanism
Other alkene 1
Other alkene 2
0 1 . 5 The carbocation (CH3)3C+ is formed as an intermediate in the reaction of
2-bromo-2-methylpropane with KCN
Suggest the value of the bond angle around the central C atom in the
(CH3)3C+ carbocation.
[1 mark]
Question 1 continues on the next page
Turn over ►
IB/M/Jun25/7404/2
, 4
Do not write
outside the
0 1 . 6 A co-ordinate bond is formed when the (CH3)3C+ carbocation reacts with CN– to box
form a nitrile.
Explain how this co-ordinate bond is formed during this reaction.
[2 marks]
14
IB/M/Jun25/7404/2
Chemistry Question Paper & Mark Scheme (Merged) Tuesday
20 May 2025 [VERIFIED]
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Tuesday 20 May 2025 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
the Periodic Table/Data Sheet, provided as an insert (enclosed) For Examiner’s Use
a ruler with millimetre measurements Question Mark
a scientific calculator, which you are expected to use where appropriate.
1
Instructions 2
Use black ink or black ball-point pen. 3
Fill in the boxes at the top of this page. 4
Answer all questions.
5
You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. 6
If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s).
Section B
All working must be shown.
Do all rough work in this book. Cross through any work you do not TOTAL
want to be marked.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 80.
Advice
You are advised to spend 65 minutes on Section A and 25 minutes on Section B.
IB/M/Jun25/G4002/V7 7404/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 This question is about halogenoalkanes.
0 1 . 1 Halogenoalkanes undergo substitution reactions with nucleophiles such as
CN–, NH3 and OH–
Explain why halogenoalkanes react with nucleophiles.
[2 marks]
0 1 . 2 2-Bromobutane reacts with ammonia to form CH3CH(NH2)CH2CH3
Complete the mechanism for this reaction.
[3 marks]
2-Bromobutane reacts with KOH to give a mixture of products.
0 1 . 3 Identify the solvent that should be used to ensure that butan-2-ol is the
main organic product when 2-brombutane reacts with KOH
[1 mark]
IB/M/Jun25/7404/2
, 3
Do not write
outside the
box
0 1 . 4 Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene and
two other alkenes.
Name and complete the mechanism to form but-1-ene from 2-bromobutane.
Identify the other two alkenes formed.
[5 marks]
Name of mechanism
Mechanism
Other alkene 1
Other alkene 2
0 1 . 5 The carbocation (CH3)3C+ is formed as an intermediate in the reaction of
2-bromo-2-methylpropane with KCN
Suggest the value of the bond angle around the central C atom in the
(CH3)3C+ carbocation.
[1 mark]
Question 1 continues on the next page
Turn over ►
IB/M/Jun25/7404/2
, 4
Do not write
outside the
0 1 . 6 A co-ordinate bond is formed when the (CH3)3C+ carbocation reacts with CN– to box
form a nitrile.
Explain how this co-ordinate bond is formed during this reaction.
[2 marks]
14
IB/M/Jun25/7404/2
