What is a common characteristic of alkenes compared to alkanes?

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Prepare for the AQA GCSE Biology Paper 2. Utilize flashcards, multiple choice sessions, and detailed explanations. Enhance your readiness for the exam with thorough study materials and expert-crafted quizzes.

Alkenes are defined by the presence of at least one carbon-carbon double bond (C=C) in their molecular structure. This double bond is a key characteristic that distinguishes them from alkanes, which are saturated hydrocarbons containing only single bonds between their carbon atoms. The presence of the double bond in alkenes not only affects their reactivity but also allows for a variety of chemical reactions, such as addition reactions, where other atoms or groups can be added to the molecule.

The saturation level of alkenes contributes to their unique behavior compared to alkanes, which do not have double bonds and are thus saturated with hydrogen atoms. This saturation affects various properties, including boiling points and stability. However, the defining feature of alkenes that sets them apart from alkanes is indeed the carbon-carbon double bond.

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