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Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Thursday 23 May 2019 Morning Time allowed: 1 hour 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements
1
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
• All working must be shown. 8
• Do all rough work in this book. Cross through any work you do not
want to be marked. 9
Section B
Information TOTAL
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*JUN197404201*
IB/G/Jun19/E10 7404/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 The structures of three organic compounds A, B and C are shown.
These compounds can be distinguished by simple test-tube reactions.
For each pair of compounds in questions 01.1 and 01.2, give a reagent
(or combination of reagents) that could be added separately to each compound to
distinguish between them.
State what is observed in each case.
0 1 . 1 Compounds A and B
[3 marks]
Reagent
Observation with A
Observation with B
0 1 . 2 Compounds A and C
[3 marks]
Reagent
Observation with A
Observation with C
6
*02*
IB/G/Jun19/7404/2
, 3
Do not write
outside the
0 2 Bromoethane reacts with potassium cyanide to form compound D. box
CH3CH2Br + KCN → CH3CH2CN + KBr
Compound D
0 2 . 1 Outline the mechanism for this reaction.
[2 marks]
0 2 . 2 Give the IUPAC name of D.
[1 mark]
0 2 . 3 Calculate the percentage atom economy for the formation of D in this reaction.
Give your answer to the appropriate number of significant figures.
[2 marks]
% atom economy 5
Turn over ►
*03*
IB/G/Jun19/7404/2
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
AS
CHEMISTRY
Paper 2 Organic and Physical Chemistry
Thursday 23 May 2019 Morning Time allowed: 1 hour 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• the Periodic Table/Data Sheet, provided as an insert (enclosed) Question Mark
• a ruler with millimetre measurements
1
• a scientific calculator, which you are expected to use where appropriate.
2
Instructions 3
• Use black ink or black ball-point pen. 4
• Fill in the boxes at the top of this page.
5
• Answer all questions.
• You must answer the questions in the spaces provided. Do not write outside 6
the box around each page or on blank pages. 7
• All working must be shown. 8
• Do all rough work in this book. Cross through any work you do not
want to be marked. 9
Section B
Information TOTAL
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 80.
Advice
You are advised to spend about 65 minutes on Section A and 25 minutes on Section B.
*JUN197404201*
IB/G/Jun19/E10 7404/2
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 The structures of three organic compounds A, B and C are shown.
These compounds can be distinguished by simple test-tube reactions.
For each pair of compounds in questions 01.1 and 01.2, give a reagent
(or combination of reagents) that could be added separately to each compound to
distinguish between them.
State what is observed in each case.
0 1 . 1 Compounds A and B
[3 marks]
Reagent
Observation with A
Observation with B
0 1 . 2 Compounds A and C
[3 marks]
Reagent
Observation with A
Observation with C
6
*02*
IB/G/Jun19/7404/2
, 3
Do not write
outside the
0 2 Bromoethane reacts with potassium cyanide to form compound D. box
CH3CH2Br + KCN → CH3CH2CN + KBr
Compound D
0 2 . 1 Outline the mechanism for this reaction.
[2 marks]
0 2 . 2 Give the IUPAC name of D.
[1 mark]
0 2 . 3 Calculate the percentage atom economy for the formation of D in this reaction.
Give your answer to the appropriate number of significant figures.
[2 marks]
% atom economy 5
Turn over ►
*03*
IB/G/Jun19/7404/2
