2025 AQA AS CHEMISTRY Paper 2 Organic and Physical Chemistry
WOKED Exam Solutions. Real Marking Scheme ATTACHED (Merged) May 2025
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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]
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0 1 . 4 Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene and two box
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
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0 1 . 6 A co-ordinate bond is formed when the (CH3)3C+ carbocation reacts with CN– to form a box
nitrile.
Explain how this co-ordinate bond is formed during this reaction.
[2 marks]
14
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WOKED Exam Solutions. Real Marking Scheme ATTACHED (Merged) 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.
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]
tyrionpapers.com
IB/M/Jun25/7404/2
, 3
Do not write
outside the
0 1 . 4 Under different conditions, 2-bromobutane reacts with KOH to form but-1-ene and two box
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 ►
tyrionpapers.com
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 form a box
nitrile.
Explain how this co-ordinate bond is formed during this reaction.
[2 marks]
14
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IB/M/Jun25/7404/2
