Alkene Preparation
Dehydrohalogenation of alkyl halides follows:
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More hydrocarbons Practice Questions
A hydrocarbon with the molecular formula C6H10 is being analysed, and the total number of degr...
A hydrocarbon with the molecular formula C6H10 is being analysed, and the total number of degr...
Among but-1-ene, cis-but-2-ene, trans-but-2-ene, and 2-methylpropene, the most thermodynamically sta...
Among but-1-ene, cis-but-2-ene, trans-but-2-ene, and 2-methylpropene, the most thermodynamically sta...
Bromine adds to cyclohexene to form a dibromide, and the stereochemical relationship between the two...
Bromine adds to cyclohexene to form a dibromide, and the stereochemical relationship between the two...
Propene is subjected to hydroboration with diborane followed by oxidation using alkaline hydrogen pe...
Propene is subjected to hydroboration with diborane followed by oxidation using alkaline hydrogen pe...
When 2-methylbutane undergoes monochlorination, several constitutional isomers form, and the total n...
When 2-methylbutane undergoes monochlorination, several constitutional isomers form, and the total n...
Benzene reacts with acetyl chloride in the presence of anhydrous aluminium chloride, and the major a...
Benzene reacts with acetyl chloride in the presence of anhydrous aluminium chloride, and the major a...
A planar cyclic conjugated species is being assessed for aromatic character, and the number of deloc...
A planar cyclic conjugated species is being assessed for aromatic character, and the number of deloc...
Restricted rotation about a carbon-carbon double bond can give rise to geometrical isomers, and the ...
Restricted rotation about a carbon-carbon double bond can give rise to geometrical isomers, and the ...
Among ethane, ethene, and ethyne, the relative ease with which a terminal hydrogen is removed as a p...
Among ethane, ethene, and ethyne, the relative ease with which a terminal hydrogen is removed as a p...
A colourless organic liquid decolourises cold dilute alkaline potassium permanganate solution rapidl...
A colourless organic liquid decolourises cold dilute alkaline potassium permanganate solution rapidl...
Hydrogen bromide is added to propene in the absence of any peroxide, and the major organic product n...
Hydrogen bromide is added to propene in the absence of any peroxide, and the major organic product n...
An unknown symmetrical alkene on reductive ozonolysis yields only propanal as the carbonyl product, ...
An unknown symmetrical alkene on reductive ozonolysis yields only propanal as the carbonyl product, ...
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.
Looking for more practice? Explore all chemistry questions or browse hydrocarbons questions on RankGuru.