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- 1. Multiple Choice
Which species could act as a nucleophile?
BH3
NH4+
PH3
SiH4
- 2. Multiple Choice
Which compound has the fastest rate of reaction with potassium cyanide to form pentanenitrile?
1-bromobutane
1-chlorobutane
1-fluorobutane
1-iodobutane
- 3. Multiple Choice
Which of the following mechanisms does not occur in reactions of bromoethane?
Electrophilic addition
Elimination
Nucleophilic substitution
- 4. Multiple Choice
Which of the arrows, labelled A, B, C or D in the mechanism in the diagram, is not correct?
A
B
C
D
- 5. Multiple Choice
This question is about a method that can be used to prepare ethylamine.
CH3CH2Br + 2NH3 → CH3CH2NH2 + NH4Br
Which of the curly arrows in the mechanism is not correct?
1
2
3
4
- 6. Multiple Choice
This question is about a method that can be used to prepare ethylamine.
CH3CH2Br + 2NH3 → CH3CH2NH2 + NH4Br
Which statement about the reaction is not correct?
Ethylamine is a primary amine.
The mechanism is a nucleophilic substitution.
Using an excess of bromoethane will prevent further reaction to form a mixture of amine products.
Ammonium bromide is an ionic compound.
- 7. Multiple Choice
Why are fluoroalkanes unreactive?
Fluorine is highly electronegative.
The F– ion is very stable.
They are polar molecules.
The C–F bond is very strong.
- 8. Multiple Choice
Pentanenitrile can be made by reaction of 1-bromobutane with potassium cyanide.
Which of these is the correct name for the mechanism of this reaction?
Electrophilic addition
Electrophilic substitution
Nucleophilic addition
Nucleophilic substitution
- 9. Multiple Choice
Which one of the following statements explains best why fluoroalkanes are the least reactive haloalkanes?
Fluorine is much more electronegative than carbon.
The F− ion is the most stable halide ion.
The C–F bond is the most polar carbon–halogen bond.
The C–F bond is the strongest carbon–halogen bond.
- 10. Multiple Choice
Which one of the following types of reaction mechanism is not involved in the above sequence?
free-radical substitution
nucleophilic substitution
elimination
- 11. Multiple Choice
Which one of the following mechanisms is not involved in the reaction sequence below?
CH3CH3 → CH3CH2Cl → CH3CH2OH → CH2=CH2 → CH3CH2Br
electrophilic addition
electrophilic substitution
nucleophilic substitution
free-radical substitution
- 12. Multiple Choice
In which of the following is a curly arrow used incorrectly?
- 13. Multiple Choice
Which one of the following reactions involves nucleophilic addition?
CH3CH = CH2 + HBr → CH3CHBrCH3
CH3CH2CH3 + Cl2 → CH3CHClCH3 + HCl
CH3CH2CH2Br + NaOH → CH3CH2CH2OH + NaBr
CH3CH2CHO + HCN → CH3CH2CH(OH)CN
- 14. Multiple Choice
Which of the following is a correct mechanism for the formation of 2-methylbut-2-enefrom 2-bromo-3-methylbutane?
- 15. Multiple Choice
How many different alkenes are formed when 2-bromo-3-methylbutane reacts with ethanolic potassium hydroxide?
2
3
4
5
- 16. Multiple Choice
How many different alkenes are formed when 2-bromo-2-methylbutane reacts with ethanolic potassium hydroxide?
2
3
4
5
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