AQA EXAMPRO A-LEVEL CHEMISTRY PRACTICE PAPER 2 SUMMER 2022 100%
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Course
A-LEVEL CHEMISTRY PRACTICE PAPER 2 SUM
Institution
A-LEVEL CHEMISTRY PRACTICE PAPER 2 SUM
1 The following table gives the names and structures of some structural isomers with the molecular formula C5H10
(a)Isomer 1 exists as E and Z stereoisomers.
(i)State the meaning of the term stereoisomers
(ii)Draw the structure of the E stereoisomer of Isomer 1.
, (ii) Draw the structure of the E stereoisomer of Isomer 1.
(1)
(b) A chemical test can be used to distinguish between separate samples of Isomer
1 and Isomer 2.
Identify a suitable reagent for the test.
State what you would observe with Isomer 1 and with Isomer 2.
_____________________________________________________________
(3)
(c) Use Table A on the Data Sheet when answering this question.
Isomer 3 and Isomer 4 have similar structures.
(i) State the infrared absorption range that shows that Isomer 3 and Isomer 4
contain the same functional group.
, (d) Two alcohols are formed by the hydration of Isomer 4.
Draw the displayed formula for the alcohol formed that is oxidised readily by
acidified potassium dichromate(VI).
(1)
(e) Isomer 4 reacts with hydrogen bromide to give two structurally isomeric
bromoalkanes.
(i) Name and outline a mechanism for the reaction of Isomer 4 with hydrogen
bromide to give 2-bromo-2-methylbutane as the major product.
(CH3)2C = CHCH3 + HBr (CH3)2CBrCH2CH3
Name of mechanism _______________________________________
Mechanism
(5)
(ii) The minor product in this reaction mixture is 2-bromo-3-methylbutane.
Explain why this bromoalkane is formed as a minor product.
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