Which compound does not have zero dipole moment ?

Options

A. `BF_(3)`
B. `CO_(2)`
C. `NF_(3)`
D. `H_(2)O`

Explanation

To determine which compound does not have a zero dipole moment, we need to analyze the molecular structures and geometries of the given compounds. The dipole moment is a vector quantity that depends on the distribution of charge within a molecule. A molecule will have a non-zero dipole moment if the individual bond dipoles do not cancel each other out.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds we need to analyze are BF3, CO2, NF3, and H2O.

2. **Analyze BF3 (Boron Trifluoride)**:
- **Structure**: BF3 has a trigonal planar structure.
- **Electronegativity**: Boron is less electronegative than fluorine.
- **Dipole Moment**: The dipole moments of the three B-F bonds point towards the fluorine atoms. These dipoles cancel each other out due to symmetry.
- **Conclusion**: BF3 has a zero dipole moment.

3. **Analyze CO2 (Carbon Dioxide)**:
- **Structure**: CO2 is a linear molecule.
- **Electronegativity**: Oxygen is more electronegative than carbon.
- **Dipole Moment**: The dipole moments of the two C=O bonds point in opposite directions and cancel each other out.
- **Conclusion**: CO2 has a zero dipole moment.

4. **Analyze NF3 (Nitrogen Trifluoride)**:
- **Structure**: NF3 has a trigonal pyramidal structure due to one lone pair on nitrogen.
- **Electronegativity**: Fluorine is more electronegative than nitrogen.
- **Dipole Moment**: The dipole moments of the N-F bonds do not cancel out because of the lone pair on nitrogen. The resultant dipole moment points towards the fluorine atoms.
- **Conclusion**: NF3 does not have a zero dipole moment.

5. **Analyze H2O (Water)**:
- **Structure**: H2O has a bent shape.
- **Electronegativity**: Oxygen is more electronegative than hydrogen.
- **Dipole Moment**: The dipole moments of the O-H bonds do not cancel out due to the bent shape of the molecule. The resultant dipole moment points towards the oxygen atom.
- **Conclusion**: H2O does not have a zero dipole moment.

### Final Answer:
The compounds that do not have a zero dipole moment are **NF3 and H2O**.