Tautomerism
Keto-enol tautomerism is shown by:
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About This Question
- Subject
- chemistry
- Chapter
- some basic principles of organic chemistry
- Topic
- tautomerism
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
All carbonyl compounds with α-hydrogen
Tautomerism is a special type of functional isomerism where the isomers exist in dynamic equilibrium.
- Requirement: For Keto-Enol tautomerism, the carbonyl compound must have at least one α-hydrogen (hydrogen on the carbon next to the carbonyl group).
- Mechanism: The α-hydrogen migrates to the oxygen, and the C=O double bond shifts to C=C.
- Formaldehyde (HCHO) has no α-carbon, so it cannot show tautomerism. Acetone and Acetaldehyde have α-hydrogens and thus display it.
This medium difficulty chemistry question is from the chapter some basic principles of organic chemistry, covering the topic of tautomerism. It appeared in the 2025 exam.
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