Which of the following compounds can show tautomeric isomerism?

Which of the following compounds can show tautomeric isomerism?

Step 1: Understand what tautomeric isomerism is. It is when a compound can exist in two different forms that can easily convert into each other.
Step 2: Identify the compound in the question, which is acetic acid.
Step 3: Recognize that acetic acid can exist in two forms: the keto form (which has a carbonyl group) and the enol form (which has a hydroxyl group attached to a double bond).
Step 4: Confirm that the keto and enol forms of acetic acid can interconvert, which is the key feature of tautomeric isomerism.
Step 5: Conclude that since acetic acid can exist in both forms, it shows tautomeric isomerism.

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