Which one is the most soluble in water ?

Options

A. Urea
B. Cholesterol
C. Uric acid
D. Fatty acids

Answer

To determine which of the given substances is the most soluble in water, we can analyze each option based on their chemical properties and solubility characteristics.

### Step-by-Step Solution:

1. **Identify the Compounds**: The options given are urea, cholesterol, uric acid, and fatty acids.

2. **Understand Solubility in Water**: Solubility in water generally depends on the ability of a compound to form hydrogen bonds with water molecules. Polar molecules tend to be more soluble in water compared to non-polar molecules.

3. **Analyze Each Compound**:
- **Urea**: Urea is a small, polar molecule that can form hydrogen bonds with water. It is highly soluble in water.
- **Cholesterol**: Cholesterol is a large, non-polar molecule and is largely insoluble in water.
- **Uric Acid**: Uric acid is less soluble in water compared to urea, as it has a more complex structure and fewer polar functional groups.
- **Fatty Acids**: Fatty acids have long hydrocarbon chains, making them largely non-polar and less soluble in water.

4. **Compare Solubility**: Among the four compounds, urea stands out as the most soluble due to its polar nature and ability to form hydrogen bonds with water.

5. **Conclusion**: Based on the analysis, the most soluble compound in water among the options is **urea**.

### Final Answer:
The most soluble in water is **urea**.

---