Alkene Preparation
Mediumchemistry
Dehydrohalogenation of alkyl halides follows:
Select the correct option:
Solution
Incorrect! Answer:
Saytzeff's rule
Dehydrohalogenation is a β-elimination reaction where a hydrogen halide (HX) is removed from an alkyl halide in the presence of a strong base (like alcoholic KOH).
- Saytzeff's Rule (Zaitsev's Rule) states that in an elimination reaction, the most substituted alkene (the one with the most alkyl groups attached to the double bond) is the preferred or major product.
- Stability: Highly substituted alkenes are more stable due to hyperconjugation.
- Example: 2-Bromobutane gives 2-Butene (major) rather than 1-Butene.
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About This Question
- Subject
- chemistry
- Chapter
- hydrocarbons
- Topic
- alkene preparation
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Saytzeff's rule
Dehydrohalogenation is a β-elimination reaction where a hydrogen halide (HX) is removed from an alkyl halide in the presence of a strong base (like alcoholic KOH).
- Saytzeff's Rule (Zaitsev's Rule) states that in an elimination reaction, the most substituted alkene (the one with the most alkyl groups attached to the double bond) is the preferred or major product.
- Stability: Highly substituted alkenes are more stable due to hyperconjugation.
- Example: 2-Bromobutane gives 2-Butene (major) rather than 1-Butene.
This medium difficulty chemistry question is from the chapter hydrocarbons, covering the topic of alkene preparation. It appeared in the 2025 exam.
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