Carbon monoxide is a poisonous gas because

Options

A. It binds to hemoglobin to form stable compound
B. It is carcinogenic in nature
C. Both (1) and (2)
D. It induces the chance of heart attack

Answer

### Step-by-Step Solution:

1. **Understanding Carbon Monoxide (CO)**:
- Carbon monoxide is a colorless and odorless gas that is highly poisonous.

2. **Mechanism of Toxicity**:
- The primary reason carbon monoxide is poisonous is due to its interaction with hemoglobin in the blood. Hemoglobin is the protein responsible for transporting oxygen in the bloodstream.

3. **Affinity of Hemoglobin**:
- Hemoglobin has a higher affinity for carbon monoxide than for oxygen. This means that when both gases are present, hemoglobin will preferentially bind to carbon monoxide.

4. **Formation of Stable Complex**:
- When carbon monoxide binds to hemoglobin, it forms a stable complex known as carboxyhemoglobin. This complex prevents hemoglobin from carrying oxygen effectively.

5. **Consequences of CO Binding**:
- The binding of carbon monoxide to hemoglobin reduces the amount of oxygen that can be transported in the blood. This can lead to hypoxia (lack of oxygen) in the body's tissues and organs.

6. **Health Implications**:
- Prolonged exposure to carbon monoxide can result in severe health issues, including organ damage and potentially death, due to the lack of oxygen.

7. **Conclusion**:
- Therefore, the reason carbon monoxide is considered a poisonous gas is that it binds to hemoglobin to form a stable compound, which inhibits the transport of oxygen in the body.

### Answer:
Carbon monoxide is a poisonous gas because it binds to hemoglobin to form a stable compound, preventing the transport of oxygen in the bloodstream.