Which of the following molecule has no dative bond?

Options

A. CO
B. `CO_(3)^(2-)`
C. `SO_(4)^(2-)`
D. All of these

Answer

To determine which of the given molecules has no dative bond, we need to analyze each option by examining their Lewis structures and identifying the presence of dative bonds (also known as coordinate covalent bonds). A dative bond is formed when one atom donates both electrons to form a bond.

### Step-by-Step Solution:

1. **Understanding Dative Bonds**:
- A dative bond is formed when both electrons in a covalent bond come from the same atom. This is different from a regular covalent bond where each atom contributes one electron.

2. **Analyzing CO (Carbon Monoxide)**:
- Carbon (C) has 4 valence electrons, and Oxygen (O) has 6 valence electrons.
- In CO, Carbon donates both electrons to form a triple bond with Oxygen. Thus, CO has a dative bond.
- **Conclusion**: CO has a dative bond.

3. **Analyzing CO3^2- (Carbonate Ion)**:
- Carbon has 4 valence electrons, and each Oxygen has 6 valence electrons.
- In the carbonate ion, the structure shows that one of the double bonds between Carbon and Oxygen involves a pair of electrons from Carbon, while the other bonds involve shared electrons from Oxygen.
- No atom donates both electrons for a bond in this structure.
- **Conclusion**: CO3^2- has no dative bond.

4. **Analyzing SO4^2- (Sulfate Ion)**:
- Sulfur (S) has 6 valence electrons, and each Oxygen has 6 valence electrons.
- In the sulfate ion, Sulfur forms bonds with four Oxygen atoms, and in this structure, one of the bonds involves a pair of electrons from Oxygen, indicating a dative bond.
- **Conclusion**: SO4^2- has a dative bond.

5. **Final Decision**:
- From the analysis, the only molecule that does not have a dative bond is **CO3^2-** (Carbonate Ion).

### Final Answer:
**The molecule that has no dative bond is CO3^2- (Carbonate Ion).**