Asked by Milanpreet kaur Chana on May 01, 2024
Verified
Which of the following alkenes is the major product when 2-bromo-2-methylpentane is treated with sodium ethoxide in ethanol?
A) 2-methylpent-1-ene
B) 2-methylpent-2-ene
C) (E) -4-methylpent-2-ene
D) (Z) -4-methylpent-2-ene
E) 4-methylpent-1-ene
Sodium Ethoxide
A strong base and nucleophile derived from ethanol and sodium, used in various organic reactions.
Ethanol
A two-carbon alcohol, commonly known as alcohol, used as a solvent, in beverages, and as a fuel additive.
- Predict the major alkene product in elimination reactions based on the mechanism (E1 or E2).
Verified Answer
DK
Dachi KvirikadzeMay 02, 2024
Final Answer :
B
Explanation :
The reaction described is an example of an E2 elimination reaction. In such reactions, the base (sodium ethoxide, in this case) removes a hydrogen atom from a carbon adjacent to the carbon bearing the leaving group (bromo in 2-bromo-2-methylpentane), leading to the formation of a double bond. The most stable alkene is typically the major product, which is generally the most substituted alkene due to Zaitsev's rule. Therefore, 2-methylpent-2-ene is the major product because it is more substituted than the other alkenes listed, making it more stable.
Learning Objectives
- Predict the major alkene product in elimination reactions based on the mechanism (E1 or E2).
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