Structured Practice: Organic Chemistry

Short, exam-style questions to practise homologous series, reactions, and conditions.

SEC G3 Pure Chemistry 2027

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Homologous series and alkanes.

State the general formula for alkanes. (1 mark): Use uppercase C and H and lowercase n. Write subscripts on the same line.
State two characteristics of a homologous series (2 marks).

Test for an alkene.

Describe the test for an alkene and the positive result (2 marks).

Addition polymerisation. Ethene molecules join to form a polymer.

Name the polymer formed from ethene. (1 mark)

Fuels and sustainability.

State the main constituent of natural gas and explain why crude oil is non-renewable (2 marks).

Manufacture and oxidation of ethanol.

Write the word equation for fermentation of glucose and name the carboxylic acid formed when ethanol is oxidised (3 marks).

Carboxylic acids and esters.

Name the ester formed from ethanol and propanoic acid, and state its other product (2 marks).

Plastic recycling.

Distinguish physical recycling from chemical recycling of plastics (2 marks).

Structured Practice: Organic Chemistry

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