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Benzene

Total questions: 21

Worksheet time: 11mins

Name
Class
Date
1.

State the type of mechanism for the reaction:

a)

Nucleophilic Addition

b)

Electrophilic Addition

c)

Nucleophilic Substitution

d)

Electrophilic Aromatic Substitution

2.

Choose the method for the preparation of benzoic acid from ethyl benzene.

a)

Heated with concentrated HNO3

b)

Heated with alkaline KMnO4 followed by acidification

c)

Addition of Cl2 in the presence of sunlight followed by the addition of NaOH in CH3CH2OH

d)

Addition of Cl2 in the presence of sunlight followed by boiling with aqueous NaOH

3.

Indicate the correct names for the following amines. Notice that for some of them, two names are applicable: an IUPAC name and a common name

a)

1-methyl-3-bromoaniline

b)

N-methyl-3-bromoaniline

c)

1-aminomethyl-3-bromobenzene

d)

3-bromo-N-methylaniline

4.

Which reagent would be used for the nitration of benzene?

I. mixture of concentrated nitric and sulphuric acids

HNO3/H2SO4

II. sodium nitrate(V) NaNO3

III. sodium nitrate(III) NaNO2

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

5.

Which of the following compound is aromatic haloalkane?

I. C6H5Cl

II. C6H5CH2Cl

III. CH3CH2Cl

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

6.

The following reaction is known as

a)

Friedel-Crafts acylation

b)

Hoffman’s Degradation

c)

Coupling reaction

d)

Friedel-Crafts alkylation

7.

The product formed when an ethylbenzene is refluxed with acidic potassium (VII) manganate is

a)

C6H5CHO

b)

C6H5COOH

c)

C6H5CH2OH

d)

C6H5CH2COOH

8.

What are the best structures for U and V in the following reaction:

a)
b)
c)
d)
9.

Choose the correct statement

a)

Carbon to carbon bond in benzene have the same bond length

b)

Cyclobutene has delocalised electrons

c)

C=C bond in cyclobutene is longer than C-C bond in butane

d)

All atoms in cyclobutene, pentane and benzene are planar

10.

Which compound below is aromatic?

a)
b)
c)
d)
11.

Which of the following statement is true of the mechanism of nitration of benzene?

a)

NO2+, nitronium ion is the nucleophilic

b)

The reaction involved free radicals

c)

Sulfuric acid acts as an electrophile

d)

NO2+, nitronium ion is formed the reaction of concentrated sulfuric acid and concentrated nitric acid

12.

Benzene reacts with chloromethane in AlCl3 to form methylbenzene. The function of AlCl3 is

a)

produce a nucleophile

b)

reduce the activation energy

c)

produce an electrophile

d)

reduce the temperature

13.

W is an aromatic organic acid which reacts with 2 moles of NaOH for neutralization. W is formed from X which has a molecular formula; C8H10. Pick the correct statement.

a)

X is ethylbenzene

b)

X contains deactivating groups

c)

W contains 2 carboxyl groups and X contains 2 methyl groups

d)

X undergoes electrophilic addition

14.

Which of the following can be used to differentiate benzene from toluene?

a)

Brady's test

b)

Tollen's reagent

c)

Oxidation test

d)

Hinsberg's test

15.

What is the IUPAC name of the following compound?

a)

1-bromo-3-fluoronitrobenzene

b)

4-bromo-2-fluoronitrobenzene

c)

5-bromo-1-fluoronitrobenzene

d)

3-bromo-1-fluoronitrobenzene

16.

What is the IUPAC name of the following compound?

a)

4-bromo-3-chlorotoluene

b)

4-bromo-5-chlorotoluene

c)

1-bromo-2-chlorotoluene

d)

2-bromo-1-chlorotoluene

17.

Which of the following statements about benzene is true?

a)

All the six hydrogens are on the same plane.

b)

The actual benzene structure is the rapid equilibrium of the two Kekule's structure.

c)

All carbon atoms are sp-hybridised.

d)

Benzene is a gas at room temperature.

18.

What is the description of benzene ring in the following reaction?

a)

A Lewis base

b)

A Lewis Acid

c)

A Bronsted-Lowry base

d)

A Bronsted-Lowry acid

19.

What is the characteristic observation when phenol reacts with iron (III) Chloride?

a)

Brick-red precipitation

b)

blue-voilet colouration

c)

white precipitation

d)

homogenous solution

20.

Which of the following statements about benzene are true?

I. Benzene does not undergo addition reaction

II. there are six pi electrons in the benzene ring

III. All the C-C bonds length in benzene are equivalent

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

21.

Which of the following statements are true regarding the electrophilic aromatic substitution reaction?

I. It is exclusive for benzene derivative only

II. It involves the formation of positively charge reactive intermediate.

III. The aromaticity is retained after the reaction.

a)

I only

b)

I and II only

c)

II and III only

d)

I, II and III

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