Which of the following is an alkene?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which of the following is an alkene?

Explanation:
Alkenes have a carbon–carbon double bond, so for straight-chain (acyclic) alkenes the formula is CnH2n. With four carbons, that gives C4H8. The option showing C4H8 fits this simple pattern, pointing to an unsaturated hydrocarbon with a C=C bond. The other formulas include oxygen and belong to different families (carboxylic acids or alcohols), which do not indicate a C=C double bond. So the compound with C4H8 is the alkene.

Alkenes have a carbon–carbon double bond, so for straight-chain (acyclic) alkenes the formula is CnH2n. With four carbons, that gives C4H8. The option showing C4H8 fits this simple pattern, pointing to an unsaturated hydrocarbon with a C=C bond. The other formulas include oxygen and belong to different families (carboxylic acids or alcohols), which do not indicate a C=C double bond. So the compound with C4H8 is the alkene.

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