11 mark
Which of these compounds would act as a nucleophile?
C2H6
H+
OH-
Al
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Syllabus Edition
First teaching 2023
First exams 2025
|
Electron Pair Sharing Reactions (SL IB Chemistry)
Topic Questions
21 mark
Ethene reacts with steam in the presence of sulfuric acid.
C2H4 + H2O → CH3CH2OH
What type of reaction is this?
acid / base
addition
hydrolysis
substitution
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31 mark
Which reaction is an example of nucleophilic substitution?
C6H6 + Br2 → C6H5Br+ HBr
CH2=CH2 + HBr → CH3CH2Br
C3H7Br + H2O → C3H7OH + HBr
C2H6 + Br2 → C2H5Br + HBr
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41 mark
Bromomethane, CH3Br, is used as a fumigant to destroy insect pests in grain that is to be stored. It can be made by reacting methanol with hydrogen bromide.
CH3OH + HBr → CH3Br + H2O
What type of reaction is this?
condensation
electrophilic substitution
free radical substitution
nucleophilic substitution
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51 mark
What reagents and conditions are needed to convert but-2-ene into butane?
Concentrated sulfuric acid, steam, 300oC
Hydrogen gas, Ni catalyst, 150oC
Acidified potassium dichromate, heating under reflux
Hydrogen bromide, room temperature
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61 mark
Which reaction(s) can alkenes undergo?
- Addition
- Hydration
- Reduction
I and II only
I and III only
II and III only
I, II and III
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11 mark
Limonene is an oil formed in the peel of citrus fruits.
Which product is formed when an excess of bromine, Br2(l), reacts with limonene at room temperature in the dark?
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21 mark
Which compound has an Mr of 84.18 and will react with HBr to give a product with an Mr of 165.09?
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31 mark
Which compound is produced in the reaction between pent-2-ene and steam?
(CH3)2CHCH2CH2OH
CH3CH(OH)CH2CH2CH2CH3
CH3CH2CH2CH2CH2OH
CH3CH2CH2CH(OH)CH3
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11 mark
Isomers X and Y both react with HBr.
A mixture of X and Y is reacted with HBr.
Which three structures represent three different possible products of this reaction?
|
A |
(CH3)2CHCBr3 |
(CH3)2CBrCHBr2 |
CH3CHBrCHBrCH3 |
|
B |
(CH3)2CHCBr3 |
(CH3)2CBrCHBr2 |
CH3CBr2CHBrCH3 |
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C |
(CH3)2CBrCBr3 |
(CH3)2CHCBr3 |
CH3CBr2CHBrCH3 |
|
D |
(CH3)2CBrCHBr2 |
CHBr2CBr(CH3)CH3 |
CH3CHBrCBr2CH3 |
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21 mark
In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the attacking group and of the leaving group?
|
|
attacking group |
leaving group |
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A B C D |
electrophile electrophile nucleophile nucleophile |
electrophile nucleophile electrophile nucleophile |
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