Among the following the weakest one is

Options

A. Metallic bond
B. Ionic bond
C. Van der waal's force
D. Covalent bond

Explanation

To determine which bond among the given options is the weakest, we can analyze the types of bonds mentioned: metallic bonds, ionic bonds, covalent bonds, and van der Waals forces.

### Step-by-Step Solution:

1. **Identify the Types of Bonds**:
- **Metallic Bond**: Found in metals, such as sodium (Na) and aluminum (Al). These bonds involve a sea of delocalized electrons and are generally strong.
- **Ionic Bond**: Formed between ions, such as in sodium chloride (NaCl). This bond is characterized by strong electrostatic attractions between positively and negatively charged ions.
- **Covalent Bond**: Found in molecules like methane (CH₄) and carbon dioxide (CO₂). These bonds involve the sharing of electrons between atoms and are typically strong, but can vary in strength.
- **Van der Waals Forces**: These are weak intermolecular forces that occur between molecules, such as in noble gases or nonpolar molecules (e.g., H₂, Cl₂).

2. **Compare the Strength of Bonds**:
- **Metallic Bonds**: Strong due to the delocalization of electrons.
- **Ionic Bonds**: Strong due to the electrostatic attraction between ions.
- **Covalent Bonds**: Generally strong, but can be weaker than ionic bonds depending on the specific molecules.
- **Van der Waals Forces**: These are the weakest among the bonds listed, as they arise from temporary dipoles and are much weaker than the other types of bonds.

3. **Conclusion**:
- Among the bonds discussed, **van der Waals forces** are the weakest. Therefore, the answer to the question is **van der Waals forces**.

### Final Answer:
The weakest bond among the given options is **van der Waals forces**.