Which of the following has highly acidic hydrogen?

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Canvas Classes · Accepted Answer

Step 1: Analyzing Acidic Hydrogens in Ketones
Acidity depends on the resonance stabilization of the conjugate base (enolate ion). 
- Pentane-2,4-dione (structure d) is a -diketone.
- The hydrogens on the central methylene group () are between two carbonyl groups.

Step 2: Determining Maximum Acidity
The enolate formed is stabilized by resonance with two adjacent  groups, making these hydrogens highly acidic ().

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