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Highest enol content will be shown by:

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Step 1: Recognize the Concept of Keto–Enol Tautomerism Keto–enol tautomerism occurs when a carbonyl compound (keto form) readily interconverts into an enol form, where the compound contains a double bond (–C=C–) and an –OH group. The amount of enol present depends on several stabilizing factors such as hydrogen bonding and resonance stabilization. Step 2: Examine Structural Features in Each Option Observe whether the compound’s enol form can be stabilized through intramolecular hydrogen bonding (forming a stable ring) or by resonance. Such features typically increase the percentage of the enol tautomer. Step 3: Identify Intramolecular Hydrogen Bonding If an enol tautomer can form a six-membered ring through intramolecular hydrogen bonding, this significantly stabilizes the enol form, pushing the equilibrium further toward that enol tautomer. Step 4: Compare the Structures Option 1: Option 2 (Correct): This compound’s enol form can be stabilized by intramolecular hydrogen bonding (creating a six-membered ring) and possible resonance, making the enol tautomer more prominent. Option 3: Option 4: Step 5: Conclude the Highest Enol Content Comparing all structures, Option 2 shows the highest enol content because its enol form gains extra stabilization through intramolecular hydrogen bonding and possibly resonance. Therefore, Option 2 is the correct answer.

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