Lesson 18A.2
18A.2 Electrophilic substitution of benzene Quiz: Pearson Edexcel Chemistry, Unit 18
20 questions
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Lesson 18A.2, Electrophilic substitution of benzene: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 18: Organic Chemistry III, written with Revision Ninja.
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The 20 questions
-
What type of reaction occurs between benzene and bromine with an iron catalyst?
- Electrophilic addition
- Electrophilic substitution
- Free radical substitution
- Nucleophilic substitution
-
What electrophile is involved in the nitration of benzene?
- Nitrite ion
- Nitronium ion
- Nitrate ion
- Ammonium ion
-
Which acid catalyst is used alongside concentrated nitric acid to nitrate benzene?
- Sulfuric acid
- Hydrochloric acid
- Phosphoric acid
- Ethanoic acid
-
What is the role of aluminium chloride in Friedel-Crafts alkylation?
- Solvent
- Nucleophile
- Electrophile
- Catalyst
-
Which catalyst is used in the bromination of benzene?
- Iron(III) bromide
- Copper(II) sulfate
- Nickel catalyst
- Platinum catalyst
-
Which halogenoalkane reacts with benzene and AlCl3 to produce methylbenzene?
- Bromobenzene
- Chloroethane
- Chloromethane
- Chlorobenzene
-
What intermediate forms when an electrophile attacks benzene?
- Carbanion
- Arenium ion
- Free radical
- Alkoxide ion
-
What is lost from the arenium ion in the final step of electrophilic substitution?
- A hydroxide ion
- A proton
- A bromide ion
- A hydride ion
-
What organic product is formed when benzene reacts with ethanoyl chloride and AlCl3?
- Phenylethanone
- Phenylmethanal
- Ethylbenzene
- Benzoic acid
-
Calculate the relative molecular mass of nitrobenzene, C6H5NO2, using Ar values C = 12, H = 1, N = 14, O = 16.
- 138
- 123
- 77
- 122
-
What is the molecular formula of bromobenzene?
- C6H4Br2
- C6H5Br
- C6H5Br2
- C6H6Br
-
Why does benzene undergo substitution rather than addition reactions?
- Retains aromatic stability
- Forms weaker bonds
- Higher activation energy
- Reduces ring strain
-
Which step is rate-determining in the electrophilic substitution of benzene?
- Loss of a proton
- Catalyst regeneration
- Attack by electrophile
- Formation of electrophile
-
What acts as the electrophile in the bromination of benzene using FeBr3?
- Bromonium ion
- Hydrogen ion
- Bromide ion
- FeBr4- ion
-
What is the by-product of the bromination of benzene in the presence of a catalyst?
- Bromine chloride
- Carbon dioxide
- Water
- Hydrogen bromide
-
How does an acyl group affect the reactivity of benzene towards electrophiles?
- Activates the ring
- Increases electron density
- Deactivates the ring
- Has no effect
-
Which electrophile is generated in Friedel-Crafts alkylation using CH3Cl and AlCl3?
- CH3+
- CH3-
- AlCl4-
- Cl+
-
What role does concentrated sulfuric acid play in the nitration of benzene?
- Acid catalyst
- Oxidising agent
- Base catalyst
- Reducing agent
-
Why is a halogen carrier needed for the bromination of benzene?
- To protonate bromine
- To activate benzene
- To reduce benzene
- To polarise bromine
-
Benzene reacts with a mixture of concentrated nitric and sulfuric acids at about 50 C. What is the main organic product?
- Nitrobenzene, C6H5NO2
- Phenylamine, C6H5NH2
- Benzoic acid, C6H5COOH
- Phenol, C6H5OH
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