A Level Chemistry A
H432/02 Synthesis and analytical techniques
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• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended responses will be assessed in questions marked with an asterisk (*).
• This document consists of 36 pages.
2 Ethanol is oxidised to ethanoic acid using acidified potassium dichromate(IV) solution. The reaction is
heated under reflux using the equipment shown in the diagram below.
What is the reason for heating under reflux?
A to ensure even heating
B to prevent any substances escaping
C to boil the mixture at a higher temperature
D to allow efficient mixing
Your answer
[1]
3 How many stereoisomers are there of CH3CH=CHCH(OH)CH2CH=CH2?
4 The functional group in an organic compound, W, was identified by carrying out two chemical tests.
The results of the tests are shown below.
Heating with acidified sodium Addition of
dichromate(VI)(aq) 2,4-dinitrophenylhydrazine(aq)
orange solution turns green yellow/orange precipitate formed
Which compound could be W?
A CH3CH2CH2OH
B CH3COCH3
C CH3CH(OH)CH3
D CH3CH2CHO
Your answer
[1]
5 Complete combustion of 40 cm3 of a gaseous hydrocarbon X requires 240 cm3 of oxygen. 160 cm3 of
carbon dioxide forms. All gas volumes are at room temperature and pressure.
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