Which of the following is an example of tautomeric isomerism?

Which of the following is an example of tautomeric isomerism?

Step 1: Understand what tautomeric isomerism means. It refers to a type of isomerism where two compounds (tautomers) can easily convert into each other by moving a hydrogen atom and changing a double bond.
Step 2: Identify the common types of tautomeric isomerism. The most well-known type is keto-enol tautomerism, where a ketone (keto form) can convert to an alcohol (enol form).
Step 3: Recognize that in keto-enol tautomerism, the keto form has a carbonyl group (C=O) and the enol form has a hydroxyl group (C=C-OH).
Step 4: Conclude that if you see a question about tautomeric isomerism, keto-enol tautomerism is a classic example.

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