Which among the following compound will give maximum enol content in solution :

Options

A. `C_(6)H_(6)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)`
B. `CH_(3)-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-CH_(3)`
C. `CH_(3)-overset(O)overset(||)C-CH_(2)-CH_(2)-CH_(3)`
D. `CH_(3)-overset(O)overset(||)C-CH_(2)-COOC_(2)H_(5)`

Answer

To determine which compound will give the maximum enol content in solution, we need to analyze the stability of the enol form compared to the keto form for each compound. The enol form is favored when it is more stable than the keto form, which is generally the case due to factors such as hydrogen bonding and resonance stabilization.

### Step-by-Step Solution:

1. **Identify the Compounds**: We have four compounds to analyze. Let's denote them as Compound 1, Compound 2, Compound 3, and Compound 4.

2. **Analyze Compound 1**:
- Structure: Assume it has a carbonyl group (C=O) with alpha hydrogens.
- Stability: The enol form can form hydrogen bonds, which may enhance its stability.

3. **Analyze Compound 2**:
- Structure: This compound has a carbonyl group flanked by two alkyl groups.
- Stability: The alpha hydrogen is more acidic due to the presence of electron-donating groups. The enol form can also form hydrogen bonds, making it more stable than the keto form.

4. **Analyze Compound 3**:
- Structure: This compound has a carbonyl group with two alpha hydrogens.
- Stability: The enol form can form hydrogen bonds, but it lacks the additional stabilization factors present in Compound 2.

5. **Analyze Compound 4**:
- Structure: This compound has a carbonyl group with an ethoxy group (OC2H5).
- Stability: The resonance effect of the ethoxy group decreases the acidity of the alpha hydrogen, making the enol form less stable compared to the keto form.

6. **Compare Stability**:
- Compound 1: Moderate enol stability due to hydrogen bonding.
- Compound 2: Highest enol stability due to increased acidity and hydrogen bonding.
- Compound 3: Lower enol stability due to lack of additional stabilization.
- Compound 4: Lowest enol stability due to resonance effects decreasing acidity.

7. **Conclusion**: Based on the analysis, Compound 2 will give the maximum enol content in solution because its enol form is significantly stabilized by the presence of acidic alpha hydrogens and hydrogen bonding.

### Final Answer:
**Compound 2 will give the maximum enol content in solution.**