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:
An alkene is an unsaturated hydrocarbon that contains a carbon–carbon double bond (C=C). This double bond is the defining feature that gives alkenes their reactivity and the general formula CnH2n for many members. Ethene fits perfectly: it has two carbon atoms bonded by a double bond and the formula C2H4, which is exactly what an alkene looks like. The other substances aren’t alkenes because they lack a C=C bond. Ethanol is an alcohol with a structure that includes an -OH group and single bonds between carbons, giving it the formula C2H5OH. Ethane is an alkane with only single bonds and the formula C2H6. Ethanoic acid is a carboxylic acid featuring a carbonyl group (C=O) and an -OH, not a carbon–carbon double bond in the main chain. So the one that is an alkene is ethene.

An alkene is an unsaturated hydrocarbon that contains a carbon–carbon double bond (C=C). This double bond is the defining feature that gives alkenes their reactivity and the general formula CnH2n for many members. Ethene fits perfectly: it has two carbon atoms bonded by a double bond and the formula C2H4, which is exactly what an alkene looks like.

The other substances aren’t alkenes because they lack a C=C bond. Ethanol is an alcohol with a structure that includes an -OH group and single bonds between carbons, giving it the formula C2H5OH. Ethane is an alkane with only single bonds and the formula C2H6. Ethanoic acid is a carboxylic acid featuring a carbonyl group (C=O) and an -OH, not a carbon–carbon double bond in the main chain.

So the one that is an alkene is ethene.

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