Hemiacetal Vs Acetal
Easychemistry
Acetal formation from hemiacetal requires removal of:
Select the correct option:
Solution
Incorrect! Answer:
Water
- Equation: Aldehyde+2×Alcohol⇌Acetal+H2O.
- Equilibrium: The reaction is reversible at every step. The conversion of a hemiacetal to an acetal involves the loss of an −OH group and its replacement by an −OR group.
- Step Mechanism: The −OH is protonated to H2O+, which leaves as a neutral molecules of water.
- Le Chatelier's Principle: To drive the reaction forward and achieve high yields of acetal, the byproduct water must be physically removed from the system (e.g., using a Dean-Stark trap or molecular sieves).
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About This Question
- Subject
- chemistry
- Chapter
- oxygen organics
- Topic
- hemiacetal vs acetal
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Water
- Equation: Aldehyde+2×Alcohol⇌Acetal+H2O.
- Equilibrium: The reaction is reversible at every step. The conversion of a hemiacetal to an acetal involves the loss of an −OH group and its replacement by an −OR group.
- Step Mechanism: The −OH is protonated to H2O+, which leaves as a neutral molecules of water.
- Le Chatelier's Principle: To drive the reaction forward and achieve high yields of acetal, the byproduct water must be physically removed from the system (e.g., using a Dean-Stark trap or molecular sieves).
This easy difficulty chemistry question is from the chapter oxygen organics, covering the topic of hemiacetal vs acetal. It appeared in the 2025 exam.
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