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Cambridge IGCSE0653Frequently examined

Science Combined 0653: C12. Organic chemistry Topical Past Paper Questions

Cambridge IGCSE Science Combined (0653) past-paper questions on C12. Organic chemistry, free. This topic is frequently examined across 26 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.

Sample questions

Summer (May/Jun) 2026Paper 4

The list shows four fractions obtained from petroleum. ## bitumen diesel oil naphtha efinery gas (a) Each fraction contains molecules of different chain length. Place these fractions in order of increasing chain length. shortest chain length $\longrightarrow$ longest chain length…

Winter (Oct/Nov) 2025Paper 4

Pentene is an alkene that contains one double carbon–carbon bond. (a) Fig. 6.1 shows the structure of one form of pentene. Fig. 6.1 (i) Use Fig. 6.1 to deduce the molecular formula of pentene. [1] (ii) The double carbon–carbon bond in pentene can be in different positions. Comple…

Spring (Feb/Mar) 2024Paper 4

(a) Petroleum contains a mixture of hydrocarbons. (i) Refinery gas and bitumen are two components separated from petroleum by process Z. State the name of process Z. [1] (ii) Describe the differences between refinery gas and bitumen. In your answer include: - the size of the mole…

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Full C12. Organic chemistry question set, mark schemes and AI worksheets

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