Which one is the most acidic compound? - DASH

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Which one is the most acidic compound?

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Step-by-Step Explanation 1. Recognize the Core Concept The question asks which compound is most acidic among the given phenolic structures. The acidity of phenols is greatly influenced by the presence and position of electron-withdrawing groups (EWGs) relative to the hydroxyl group. 2. Effect of Electron-Withdrawing Groups Electron-withdrawing groups such as the nitro group ($\text{NO}_2$) stabilize the phenoxide ion formed after deprotonation of phenol. When these EWGs are placed at the ortho ($o$) and para ($p$) positions, they enhance the resonance stabilization of the negative charge on the oxygen, thereby increasing the acidity of the phenol. 3. Analyzing the Given Options Option 1: Has fewer or less effectively placed electron-withdrawing groups. Option 2: May have some substituents but not strongly electron-withdrawing, or not placed optimally to enhance acidity. Option 3: Picric acid (2,4,6-trinitrophenol) contains three $\text{NO}_2$ groups at the ortho and para positions relative to the phenolic OH. Option 4: Again, does not bear as many or as effectively positioned EWGs as Option 3. 4. Why Picric Acid (Option 3) is the Most Acidic Picric acid has three strong electron-withdrawing nitro groups at positions 2, 4, and 6. This configuration exerts a powerful -I (inductive) and -R (resonance) effect, stabilizing the negative charge on the oxygen after deprotonation. Hence, among the given compounds, the presence of three $\text{NO}_2$ groups at critical positions in picric acid makes it the strongest acid. 5. Conclusion The correct answer is: Picric acid (2,4,6-trinitrophenol) is the most acidic due to the combined strong electron-withdrawing influence of the nitro groups at ortho and para positions.

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