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25.2a Electrophilic substitution reactions of benzene

Total questions: 8

Worksheet time: 4mins

Name
Class
Date
1.

What is an electrophile?

a)

A species that takes part in a reaction by donating a lone pair of electrons

b)

A species that takes part in a reaction by accepting a lone pair of electrons

c)

A species with a positive charge that takes part in a reaction

2.

What is electrophilic substitution?

a)

A substitution reaction in which an electrophile is substituted for the electrons in the benzene ring

b)

A substitution reaction in which the benzene ring is attacked by a lone pair of electrons from an electrophile

c)

A substitution reaction in which an electrophile is attacked by the electrons in the benzene ring

3.

What are delocalised electrons?

a)

Electrons that are not attached to any of the atoms in a molecule

b)

Electrons that are shared between more than two atoms in a molecule

c)

Electrons that are not attached to any one particular atom but free to move over all the atoms in a molecule

4.

What is a pi bond?

a)

A covalent bond formed by the sideways overlap of p-orbitals

b)

A covalent bond formed by the end-to-end overlap of p-orbitals

c)

A covalent bond formed by the overlap of s-orbitals

5.

What is a nitronium ion?

a)

A negative ion formed by a nitrating mixture of concentrated nitric and sulfuric acids, which acts as an electrophile

b)

A positive ion formed by a nitrating mixture of dilute nitric and sulfuric acids, which acts as an electrophile

c)

A positive ion formed by a nitrating mixture of concentrated nitric and sulfuric acids, which acts as an electrophile

6.

What is acylation?

a)

Substitution of one of the hydrogen atoms of a benzene ring by an acyl group from an acyl chloride

b)

Addition to the benzene ring of an alkyl group from a halogenoalkane

c)

Addition to the benzene ring of an acyl group from an acyl chloride

7.

What is a Friedel-Crafts reaction?

a)

An electrophilic substitution reaction

b)

A reaction to form a C-C bond to an aromatic ring

c)

A reaction involving a Lewis acid

8.

What can happen if benzene is reacted with nitric acid above 50 degrees Celsius?

a)

1,3-dinitrobenzene is formed

b)

The mixture might form TNT and explode

c)

The benzene is hydrogenated to form cyclohexane