1
1 mark
The delocalised electrons in benzene result from the overlap of
s orbitals to form σ bonds
s orbitals to form bonds
p orbitals to form σ bonds
p orbitals to form bonds
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Organic Chemistry: Arenes (Edexcel International A Level (IAL) Chemistry): Exam Questions
Exam code: YCH11
1 hour14 questions
2
1 mark
Which of these correctly gives the reagents and conditions for the nitration of benzene?
Concentrated HNO3 and concentrated H2SO4, above 55 °C
Concentrated HNO3 and concentrated H2SO4, below 55 °C
Concentrated HNO3 and dilute H2SO4, below 55 °C
Dilute HNO3 and concentrated H2SO4, below 55 °C
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1a
1 mark
Methylbenzene reacts with a mixture of concentrated nitric acid and concentrated sulfuric acid to form 2,4,6‐ trinitromethylbenzene.
What is the number of peaks in the 13C NMR spectrum of methylbenzene?
seven
six
five
four
1b
1 mark
What type of reaction takes place?
nucleophilic addition
nucleophilic substitution
electrophilic addition
electrophilic substitution
1c
1 mark
Which expression shows the mass in grams of 2,4,6‐trinitromethylbenzene formed from 10 g of methylbenzene if the yield of the reaction is 85%?
[Mr values: methylbenzene = 92 2,4,6‐trinitromethylbenzene = 227]
(10 × 85 × 227) ÷ (92 × 100)
(10 × 100 × 227) ÷ (92 × 85)
(10 × 100 × 227) ÷ (92 × 115)
(10 × 115 × 227) ÷ (92 × 100)
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2
1 mark
Benzene is sometimes represented by a Kekulé structure.
If this were the only structure of benzene, what would be the total number of isomers of dichlorobenzene?
two
three
four
five
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3
1 mark
What is the product when benzene reacts with fuming sulfuric acid?
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4
1 mark
Which of these could not be formed when excess benzene is heated with trichloromethane, CHCl3, in the presence of an aluminium chloride catalyst?
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5
1 mark
Hydrogen bonds are formed when methylamine dissolves in water.
Which structure best represents a hydrogen bond between methylamine and water?
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6
1 mark
What is the molar mass, in g mol–1, of the organic product when phenol reacts with excess bromine water?
156.9
172.9
330.7
488.5
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7
1 mark
The standard enthalpy change of hydrogenation of cyclohexene is −120 kJ mol-1. The skeletal formulae of cyclohexene and benzene are shown.
Which of these is the correct value for the standard enthalpy change of hydrogenation of benzene?
−360 kJ mol-1
−208 kJ mol-1
−152 kJ mol-1
−120 kJ mol-1
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1
1 mark
The reaction of ethene with bromine occurs under normal laboratory conditions but the reaction of benzene with bromine to form bromobenzene requires heat and the presence of a catalyst.
The best explanation for the difference in reactivity is that the delocalised electrons in benzene
repel electrophiles
result in a kinetic barrier to intermediate formation
result in benzene having an endothermic enthalpy of formation
make benzene thermodynamically stable with respect to the formation of bromobenzene
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