More acidic than ethanol is

Options

A. `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3)`
B. `CH_(3)CO_(2)CH_(2)CH_(3)`
C. `CH_(3)COCH_(2)COCH_(3)`
D. `CH_(3)COCH_(3)`

Answer

To determine which compound is more acidic than ethanol, we need to analyze the acidity of different compounds in comparison to ethanol. The acidity of a compound is often related to the stability of the conjugate base formed after the compound donates a proton (H⁺).

### Step-by-Step Solution:

1. **Identify Ethanol**:
- Ethanol (C₂H₅OH) can be represented as CH₃CH₂OH. When it donates a proton (H⁺), it forms the ethoxide ion (C₂H₅O⁻).
- The stability of the ethoxide ion will help us understand the acidity of ethanol.

2. **Understand Acidity**:
- A compound is more acidic if its conjugate base (after losing H⁺) is more stable. Stability can arise from factors such as electronegativity, resonance, and inductive effects.

3. **Analyze Compounds**:
- We need to compare ethanol with other compounds to see which one has a more stable conjugate base.

4. **Consider the First Compound**:
- If the first compound has a negative charge on a carbon atom, it is less stable compared to a negative charge on an oxygen atom (like in ethoxide). Therefore, this compound is likely not more acidic than ethanol.

5. **Consider the Second Compound**:
- If this compound allows for resonance stabilization of the negative charge, it may be more acidic than ethanol. However, if the resonance does not stabilize the negative charge as effectively as the ethoxide ion, it may not be more acidic.

6. **Consider the Third Compound**:
- If the third compound has an active methylene group, it can stabilize the negative charge through resonance from both sides. This increased stabilization of the conjugate base suggests that this compound is likely to be more acidic than ethanol.

7. **Conclusion**:
- The third compound, which has an active methylene group, is more acidic than ethanol due to the resonance stabilization of its conjugate base.

### Final Answer:
The compound with an active methylene group is more acidic than ethanol.