Which one of the following contains ionic , covalent and coordinate bonds ?

Options

A. `NaOH`
B. NaCl
C. NaCN
D. NaNC

Explanation

To determine which compound contains ionic, covalent, and coordinate bonds, we can analyze the given options step by step. Let's consider the example of sodium isocyanide (NaNC) as mentioned in the video transcript.

### Step-by-step Solution:

1. **Identify the Bonds in Sodium Isocyanide (NaNC)**:
- Sodium (Na) is a metal and typically forms ionic bonds. In NaNC, sodium donates an electron to form Na⁺.
- The isocyanide ion (NC⁻) consists of a carbon atom triple-bonded to a nitrogen atom, which indicates a covalent bond between carbon and nitrogen.

2. **Analyze the Structure of the Isocyanide Ion (NC⁻)**:
- The isocyanide ion (NC⁻) can be derived from hydrogen cyanide (HCN). In HCN, carbon forms a triple bond with nitrogen, and when H⁺ is removed, the remaining ion is NC⁻.
- In this ion, carbon has a lone pair of electrons that it can donate, indicating the presence of a coordinate bond when it forms a bond with another atom or ion.

3. **Identify the Types of Bonds**:
- **Ionic Bond**: The bond between Na⁺ and NC⁻ is ionic.
- **Covalent Bond**: The bond between carbon and nitrogen in NC⁻ is covalent.
- **Coordinate Bond**: If NC⁻ interacts with another atom (like H⁺), the bond formed by the donation of the lone pair from carbon to form a new bond is a coordinate bond.

4. **Conclusion**:
- Sodium isocyanide (NaNC) contains an ionic bond (Na⁺ and NC⁻), a covalent bond (between C and N in NC⁻), and a coordinate bond (when NC⁻ interacts with another atom). Therefore, the answer is sodium isocyanide.

### Final Answer:
The compound that contains ionic, covalent, and coordinate bonds is **Sodium Isocyanide (NaNC)**.