Question

Condition for tautomerism

Answer 1

Answer:

The condition is that it must leave at least one alpha hydrogen .

Explanation:

For example, acetophenone and butan-2-one show keto-enol tautomerism, but benzaldehyde and benzophenone don't show keto-enol tautomerism, since they don't have any alpha hydrogens.

Answer 2

Condition for tautomerism

Explanation:

• Tautomerism occurs when two isomers exist in mobile equilibrium with each other. Isomers are molecules having the same atomic composition.
• Tautomers are constitutional isomers of two compounds that readily inter converted between one another. One of the most common examples of tautomers are the isomers of phenol.
• Erlenmeyer rule. One of the early investigators into keto–enol tautomerism was Emil Erlenmeyer. His Erlenmeyer rule, developed in 1880, states that all alcohols in which the hydroxyl group is attached directly to a double-bonded carbon atom become aldehydes or ketones.

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