Oxford AQA IGCSE · Combined Science (9204)

Organic chemistry: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Organic chemistry.

10 questions22 marksFree, no account

Question 1

1 mark

Which of the following represents the functional group present in all carboxylic acids, such as ethanoic acid?

Question 2

1 mark

Ethanol for use as a biofuel is produced by the fermentation of plant materials. Which condition is essential for this process?

Question 3

1 mark

A student compares a \(0.1\text{ mol/dm}^{3}\) solution of ethanoic acid with a \(0.1\text{ mol/dm}^{3}\) solution of hydrochloric acid. Which of the following is correct for the ethanoic acid solution?

Question 4

1 mark

Which molecular formula belongs to a member of the alkene homologous series?

Question 5

1 mark

What gas is produced when an alcohol, such as ethanol, reacts with sodium metal?

Question 6

2 marks

Identify the functional group that is present in all alcohols, such as ethanol.

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Question 7

3 marks

Describe the observed color change when bromine water is added to an unsaturated hydrocarbon like ethene.

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Question 8

5 marks

Explain why thermosetting polymers do not melt when they are heated, whereas thermosoftening polymers do.

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Question 9

3 marks

Crude oil is a mixture of many different hydrocarbons that can be separated by fractional distillation.

a. Name the physical property that allows these hydrocarbons to be separated.
b. In a fractionating column, state whether the temperature is higher at the top or the bottom.
c. Explain why larger molecules condense near the bottom of the column.

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Question 10

4 marks

The diagram below shows the formation of a polymer from ethene monomers.

a. Name the type of polymerisation shown in the diagram.
b. Draw the repeating unit for the polymer poly(propene), starting from a propene monomer (\(C_{3}H_{6}\)).
c. Explain the term 'unsaturated' in relation to the monomer ethene.

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