Alkenes
Overview
Alkenes are the reactive cousins of alkanes. Their defining feature - a carbon-carbon double bond - makes them unsaturated and opens the door to addition reactions that alkanes simply cannot undergo.
In this lesson you will learn the general formula for alkenes, how to draw their structural and displayed formulae for up to four carbon atoms, why the C=C functional group makes them unsaturated, and how to use bromine water as a simple test to tell alkenes and alkanes apart.
Objectives
- Know that alkenes contain the functional group C=C
- Know the general formula for alkenes
- Explain why alkenes are classified as unsaturated hydrocarbons
- Understand how to draw the structural and displayed formulae for alkenes with up to four carbon atoms
- Describe the reactions of alkenes with bromine to produce dibromoalkanes
- Describe how bromine water can be used to distinguish between an alkane and an alkene
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Alkenes. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The general formula for alkenes is: A) CnH2n+2 B) CnH2n C) CnH2n-2 D) CnHn Answer: B
- Alkenes are described as unsaturated because they contain: A) Only single bonds B) A carbon-carbon double bond C) A carbon-oxygen bond D) An OH group Answer: B
- When ethene reacts with bromine, the reaction type is: A) Substitution B) Combustion C) Addition D) Decomposition Answer: C
- Bromine water is decolorised by: A) Methane B) Propane C) Butane D) Ethene Answer: D
- Which is the simplest alkene? A) Methene B) Ethene C) Propene D) Butene Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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