11 mark
Which pairs of homologous series do not have the same C:H ratio in their general formulae?
Aldehydes and ketones
Alkanes and alkenes
Carboxylic acids and esters
Alkenes and aldehydes
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Syllabus Edition
First teaching 2023
First exams 2025
|
Characteristic Organic Reactions (CIE A Level Chemistry)
Topic Questions
21 mark
The following mechanism shows hydrogen cyanide reacting with propanone.
Which of the following statements is incorrect?
Heterolytic bond breaking is involved.
CN- is an electrophile.
This is an addition reaction.
Propanone is a ketone.
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31 mark
Which of the following statements correctly describes ‘electrophilic addition’?
The organic molecule acts as a nucleophile and becomes more saturated.
The organic molecule acts as an electrophile and becomes more saturated.
The organic molecule acts as a nucleophile and becomes less saturated.
The organic molecule acts as an electrophile and becomes less saturated.
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41 mark
Which of these compounds would act as a nucleophile?
C2H6
H+
OH-
Cl•
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11 mark
The reaction sequence below shows a pair of reaction types.
Which row in the table correctly shows the two reaction types?
|
Reaction 1 |
Reaction 2 |
|
|
A |
Nucleophilic addition |
Nucleophilic substitution |
|
B |
Electrophilic addition |
Electrophilic substitution |
|
C |
Nucleophilic addition |
Electrophilic substitution |
|
D |
Electrophilic addition |
Nucleophilic substitution |
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21 mark
The methyl group, CH3, can exist as an anion, a cation or a free radical. Molecules that contain a methyl group can act as a nucleophile, an electrophile or a free radical depending on the number of outer shell electrons on the methyl carbon atom.
How many outer shell electrons must be present for CH3 to act in these different ways?
|
CH3 as a nucleophile |
CH3 as a electrophile |
CH3 as a free radical |
|
|
A |
6 |
8 |
7 |
|
B |
8 |
6 |
7 |
|
C |
6 |
7 |
8 |
|
D |
8 |
7 |
6 |
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31 mark
Which of the following statements about nucleophiles and electrophiles are always true?
|
Nucleophile |
Electrophile |
|
|
A |
Has a lone pair of electrons |
Accepts a pair of electrons |
|
B |
Is a negative ion |
Is a positive ion |
|
C |
Attacks double bonds |
Is only involved in substitution reactions |
|
D |
Accepts a pair of electrons |
Has a lone pair of electrons |
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11 mark
1-chloroethane, CH3CH2Cl and NaOH (aq) are reagents in a reaction.
Which row correctly describes what type of reaction this would be?
Nucleophilic addition
Nucleophilic substitution
Electrophilic addition
Electrophilic substitution
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21 mark
Which features about the members of a homologous series are correct?
|
|
All members have the same general formula |
The members have similar chemical properties |
The members show a gradual change in physical properties |
|
A |
✓ |
✓ |
✓ |
|
B |
✓ |
⨯ |
✓ |
|
C |
⨯ |
✓ |
✓ |
|
D |
✓ |
✓ |
⨯ |
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31 mark
Which diagram shows the heterolytic fission of the C-Cl bond to form a carbocation and Cl–?
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