Introduction to aromatic chemistry

Question 1

What are Arenes?

Answer 1

Arenes are aromatic hydrocarbons containing one or more benzene rings. A benzene molecule is a ring of six carbon atoms, each of which is bonded to one hydrogen atom.

Question 2

Draw benzene and give its molecular formula.

Answer 2

Molecular formula : C6H6

Any compound with the benzene ring is classifiied as an aromatic compound.

Question 3

Where do arenes occur?

Answer 3

Arenes occur naturally in materials such as crude oil and coal, and can be produced in refineries from crude oil.

Question 4

Name the compound compound.

Answer 4

Nitrobenzene

Question 5

Name the compound

Answer 5

Chlorobenzene

Question 6

Name the compound

Answer 6

Ethylbenzene

Question 7

Name the compound

Answer 7

2- bromomethylbenzene

Note: Carbon atoms in the benzene ring are numbered to give the smallest numbers.

Question 8

Describe the properties and characteristics of benzene.

Answer 8

Benzene is a colourless liquid with a sweet odour. It is highly flammable and is formed in both natural processes and human activities.

Benzene is classified as a carcinogen - a chemical known or believed to cause cancer in humans.

Question 9

Name some natural sources of benzene and human activies that produce benzene.

Answer 9

• Natural sources of benzene include volcanoes and forest fires.
• Benzene is a component of crude oil, petrol and cigarette smoke.