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INTERNATIONAL AS
CHEMISTRY (9620)
Unit 2: Organic 1 and Physical 1
Tuesday 12 January 2021 07:00 GMT Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
For Examiner’s Use
• the Periodic Table/Data Sheet, provided as an insert
• 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).
8
• 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 70.
*JAN21CH0201*
IB/M/Jan21/E11 CH02
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about halogenoalkanes.
0 1 . 1 A halogenoalkane can be formed from an alkane in a free–radical substitution
reaction.
Describe how a covalent bond breaks to form two free–radicals.
Name this step in the mechanism.
[2 marks]
How a covalent bond breaks
Name of step
0 1 . 2 One molecule of a chloroalkane contains seven carbon atoms and one chlorine atom.
Deduce the relative molecular mass of the chloroalkane.
[2 marks]
Relative molecular mass
0 1 . 3 The skeletal formula of a halogenoalkane is shown.
Use IUPAC rules to name this halogenoalkane.
[1 mark]
*02*
IB/M/Jan21/CH02
, 3
Do not write
outside the
0 1 . 4 1-Bromobutane reacts with a solution of sodium hydroxide to form an alcohol. box
Outline the mechanism for this reaction.
[2 marks]
Mechanism
0 1 . 5 1-Bromobutane can also react with sodium hydroxide to form an alkene.
State the role of sodium hydroxide in this reaction.
Give the condition that would produce the maximum yield of alkene.
[2 marks]
Role
9
Condition
Turn over for the next question
Turn over ►
*03*
IB/M/Jan21/CH02
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