Cambridge OCR GCSE (9-1) · Gateway Science - Chemistry A - J248

Organic chemistry: Practice Questions

3 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Organic chemistry.

6 questions20 marksFree, no account

Question 1

1 mark

Which of the following correctly identifies the general formula for the homologous series of alkanes and the reason for their classification as saturated hydrocarbons?

Question 2

1 mark

A sample of decane (\(C_{10}H_{22}\)) undergoes thermal cracking to produce ethene (\(C_2H_4\)) and one other hydrocarbon molecule. What is the molecular formula and the name of the other hydrocarbon produced in this specific reaction?

Question 3

1 mark

Polyesters are formed through condensation polymerisation. Which statement correctly describes the requirements for the monomers used to create a polyester chain?

Question 4

5 marks

Explain the fundamental difference between addition and condensation polymerisation in terms of the functional groups required and the formation of byproducts.

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Question 5

5 marks

Describe the process of catalytic cracking and explain why it is necessary for meeting the global demand for specific hydrocarbon fractions.

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Question 6

7 marks

Polymers can be produced through different chemical processes depending on the functional groups present in the monomers.
a) Compare the basic principles of addition polymerisation and condensation polymerisation. Your answer should refer to the number of monomers involved and any by-products formed.
b) A polyester can be formed from a monomer containing two carboxylic acid groups and a monomer containing two alcohol groups. Describe the linkage formed and name the small molecule released during this process.

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