alkene preparation

Question

Dehydrohalogenation of alkyl halides follows:

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**Dehydrohalogenation** is a $\beta$-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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alkene preparation

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