Shapes of Aromatic Organic Molecules; σ & π Bonds (Cambridge (CIE) A Level Chemistry): Exam Questions

Exam code: 9701

23 mins4 questions
1a
2 marks

This question is about benzene.

Draw the displayed formula for benzene.

1b
1 mark

State the bond angle in the planar regular hexagon structure of benzene.

1c
1 mark

State the type of hybridisation of the carbon atoms in benzene.

1a
3 marks

Benzene can exist as C6H6 or be substituted in a number of different ways to form aromatic compounds.

State the IUPAC name for compounds W, X and Y

nrhdxjs-_benzene-compounds
1b
1 mark

State the IUPAC name for compound Z.

cd80e300-b21c-42e9-991c-55888972d64d
1c
1 mark

State the bond angle that is present in the benzene molecule.

1d
1 mark

In benzene, each of the carbon atoms is sp2 hybridised.

i) Explain how neighbouring carbon atoms form σ bonds.

[1]

ii) Neighbouring carbon atoms also form π bonds. Explain how these π bonds are formed.

[1]

2a
2 marks

State the IUPAC name for the following aromatic compounds

screenshot-2024-03-26-200018

compound X ..........................................................................

compound Y ......................................................................... 

2b
2 marks

Explain why the benzene ring is planar.

2c
2 marks

Compound X can be formed from benzene. Outline the reagents for the two step reaction to formation of compound X

step 1 .......................................................................................

step 2 ......................................................................................

3a
1 mark

State the bond angle that is present in the benzene molecule.

3b
5 marks

Explain why a molecule of benzene, C6H6 does not tend to react with bromine whereas hexene, C6H12, will react to form dibromohexane, C6H12Br2

3c
1 mark

State the name of the mechanism that benzene will undergo if reacted with bromine in the presence of a halogen carrier to form bromobenzene, C6H5Br.