Which does not react with cold water :

Options

A. SiC
B. AlN
C. `CaC_(2)`
D. `Al_(4)C_(3)`

Explanation

To determine which substance does not react with cold water, we can analyze the nature of the compounds mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Types of Compounds**:
- Ionic compounds typically react with water because they dissociate into ions.
- Covalent compounds generally do not react with water.

2. **Consider the Elements Mentioned**:
- **Aluminium**: This is a metal that can react with water, especially when heated. However, it can also react with cold water under certain conditions.
- **Calcium Carbide (CaC2)**: This compound reacts with water to produce calcium hydroxide and acetylene gas (C2H2).
- **Aluminium Nitride (AlN)**: This compound reacts with water to produce aluminium hydroxide and ammonia (NH3).
- **Silicon Carbide (SiC)**: This is a covalent compound and does not react with cold water.

3. **Evaluate Each Compound**:
- **Aluminium**: Reacts with water.
- **Calcium Carbide**: Reacts with water.
- **Aluminium Nitride**: Reacts with water.
- **Silicon Carbide**: Does not react with water.

4. **Conclusion**:
- Among the compounds mentioned, **Silicon Carbide (SiC)** is the one that does not react with cold water due to its covalent nature.

### Final Answer:
Silicon Carbide (SiC) does not react with cold water.

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