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Match List-I with List-II. List-I (Compound): A. Ethanol B. Phenol C. m-Nitrophenol D. p-Nitrophenol List-II (pK_a value): I. 10.0 II. 15.9 III. 7.1 IV. 8.3 Choose the correct answer from the options given below: (1) A → III, B → IV, C → I, D → II (2) A → IV, B → I, C → II, D → III (3) A → I, B → II, C → III, D → IV (4) A → II, B → I, C → IV, D → III

1. A → III, B → IV, C → I, D → II
2. A → IV, B → I, C → II, D → III
3. A → I, B → II, C → III, D → IV
4. A → II, B → I, C → IV, D → III

Correct answer: A → II, B → I, C → IV, D → III

Solution

The correct option matches ethanol with a pK_a of 16.0, indicating its weak acidity, while phenol has a pK_a of 10.0, showing it is more acidic than ethanol. m-Nitrophenol is more acidic than phenol due to the electron-withdrawing nitro group, giving it a pK_a of 8.3, and p-Nitrophenol is even more acidic, with a pK_a of 7.1.

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