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WorksheetsOCR A Chemistry – 'Haloalkanes' 4.2.2
Total questions: 9
Worksheet time: 4mins
Each C–X bond is hydrolysed at a different rate.
Which is the correct order of this rate and explanation?
fastest C–F ... C–I slowest BECAUSE fluorine is the most reactive halogen
fastest C–F ... C–I slowest BECAUSE fluorine is the most electronegative
fastest C–I ... C–F slowest BECAUSE iodine has a larger atomic radius
fastest C–I ... C–F slowest BECAUSE C–I has the lowest bond enthalpy
Which is the best definition of a nucleophile?
...is an electron pair donor
...is attracted to an electrophile
...is where a curly arrow starts
...is a region of electron density
Which of the following is NOT able to be a nucleophile
[OH]–
an alkene
a cation
NH3
Which correctly shows the compound and its environmental impact?
A
B
C
D
To measure the rate of hydrolysis of a series of haloalkanes, different haloalkanes are added to separate test tubes of ethanol.
What must be added when the stopwatch is started, and when must the stopwatch be stopped?
AgNO3 — a precipitate forms
Ag2CO3(aq)— effervescence is seen
AgNO3(aq)— a precipitate forms
Al(OH)3— effervescence is seen
How many carbons are bonded to the halogen atom in a secondary haloalkane?
(a)
The breakdown of the ozone layer...
TICK ALL THAT APPLY
...is catalysed by any radical in the upper atmosphere
...involves heterolytic fission, caused by UV radiation
...involves oxygen in its atomic form
...is a reversible reaction
When CF3Cl catalyses the breakdown of ozone, this species is part of the propagation steps:
TICK ALL THAT APPLY
CF3•
F•
ClO•
OF2
Which bond breaks in the initiation step of the mechanism for breaking down of ozone by CFCs?
C—C
Cl—C
Cl—Cl
C—F
