2025 AQA AS CHEMISTRY Paper 2 Organic and Physical Chemistry
Question Paper & Mark Scheme (Merged)
Tuesday 20 May 2025 [VERIFIED]
, 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.
IB/M/Jun25/7404/2
, 3
Do not write
0 1 . 3 Identify the solvent that should be used to ensure that butan-2-ol is outside the
the main organic product when 2-brombutane reacts with KOH
[1 mark]
IB/M/Jun25/7404/2
, 4
Do not write
outside the
0 1 . Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene box
4
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]
IB/M/Jun25/7404/2
Question Paper & Mark Scheme (Merged)
Tuesday 20 May 2025 [VERIFIED]
, 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.
IB/M/Jun25/7404/2
, 3
Do not write
0 1 . 3 Identify the solvent that should be used to ensure that butan-2-ol is outside the
the main organic product when 2-brombutane reacts with KOH
[1 mark]
IB/M/Jun25/7404/2
, 4
Do not write
outside the
0 1 . Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene box
4
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]
IB/M/Jun25/7404/2
