Question detail
What type of bond is formed in alkenes that allows for electrophilic addition reactions?
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. Sigma bond
- B. Pi bond
- C. Ionic bond
- D. Hydrogen bond
Answer
Pi bond
Explanation
Alkenes contain a double bond consisting of one sigma bond and one pi bond. The pi bond is weaker and more reactive, making it susceptible to attack by electrophiles during electrophilic addition reactions.
Common mistake
Testing for Unsaturation with Bromine Water
Students often incorrectly state that bromine water changes color when it comes into contact with alkenes without mentioning the role of unsaturation.
To correctly explain the test for unsaturation, state the formula: Bromine water (Br2) reacts with unsaturated compounds (alkenes) to form colorless dibromo compounds. Substitution: When bromine water is added to an alkene, the C=C double bond reacts with Br2. Working: The reaction leads to the decolorization of bromine water, indicating the presence of unsaturation. Answer: The bromine water will turn from brown to colorless, confirming unsaturation. Units/Conclusion: The test confirms the presence of a C=C double bond in the alkene.
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