Question detail
What happens when bromine water is added to an alkene?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Alkenes
Question
- A. The solution turns colorless, indicating unsaturation.
- B. The solution remains brown, indicating no reaction.
- C. The solution turns yellow, indicating the presence of a polymer.
- D. The solution bubbles, indicating a gas is produced.
Answer
The solution turns colorless, indicating unsaturation.
Explanation
The correct option is The solution turns colorless, indicating unsaturation.. The solution turns colorless, indicating unsaturation. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain why the C=C bond is attacked by electrophiles. This reasoning is anchored to Structure, bonding and reactivity in Alkenes, and it separates electrophile from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misunderstanding Electrophile Attack
Students often think that the C=C bond is attacked by electrophiles because it is simply a double bond without understanding the role of electron density.
The C=C bond has a high electron density due to the presence of pi bonds, which attracts electrophiles. This attraction occurs because electrophiles are electron-deficient species that seek out areas of high electron density. As a result, the C=C bond is susceptible to attack, leading to the formation of new products through electrophilic addition reactions.
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