Which of the following cannot form hydrogen bonds with water?

Options

A. `Ch_(3)OCH_(3)`
B. `Na^(+)`
C. `F^(-)`
D. `HCOOH`

Explanation

To determine which of the following cannot form hydrogen bonds with water, we need to analyze the options based on their ability to interact with water molecules through hydrogen bonding. Hydrogen bonds typically form between a hydrogen atom covalently bonded to an electronegative atom (like oxygen, nitrogen, or fluorine) and another electronegative atom.

### Step-by-Step Solution:

1. **Understanding Hydrogen Bonds**:
- Hydrogen bonds occur when a hydrogen atom is bonded to a highly electronegative atom (like O, N, or F) and is attracted to another electronegative atom.

2. **Analyzing Each Option**:
- **Option 1**: Contains an electronegative atom (Oxygen).
- **Conclusion**: Can form hydrogen bonds with water.
- **Option 2**: Contains Sodium (Na+), which is a metal and not electronegative.
- **Conclusion**: Cannot form hydrogen bonds with water.
- **Option 3**: Contains an electronegative atom (Fluorine).
- **Conclusion**: Can form hydrogen bonds with water.
- **Option 4**: Contains two Oxygen atoms.
- **Conclusion**: Can form hydrogen bonds with water.

3. **Final Conclusion**:
- The only option that cannot form hydrogen bonds with water is **Option 2 (Na+)**.

### Answer:
**Option 2 (Na+) cannot form hydrogen bonds with water.**