`CO_(2)` is isostructural with

Options

A. `HgCI_(2)`
B. `C_(2)H_(2)`
C. `SnCI_(2)`
D. `NO_(2)`

Explanation

To determine which molecules are isostructural with CO₂ (carbon dioxide), we need to analyze the molecular geometry of CO₂ and compare it with other molecules.

### Step-by-Step Solution:

1. **Identify the Structure of CO₂:**
- CO₂ is a linear molecule. It consists of one carbon atom double bonded to two oxygen atoms (O=C=O). The bond angle is 180 degrees.

2. **Analyze the Structure of HgCl₂ (Mercuric Chloride):**
- HgCl₂ also has a linear structure. The mercury atom is bonded to two chlorine atoms with no lone pairs on the mercury atom. Thus, the bond angle is also 180 degrees.

3. **Analyze the Structure of C₂H₂ (Acetylene):**
- C₂H₂ is another linear molecule. It consists of two carbon atoms triple bonded to each other and each carbon is bonded to one hydrogen atom (H-C≡C-H). The bond angle is 180 degrees.

4. **Analyze the Structure of SnCl₂ (Stannous Chloride):**
- SnCl₂ has a V-shaped (or bent) structure because the tin atom has two bond pairs and one lone pair. This results in a bond angle of less than 120 degrees.

5. **Analyze the Structure of NO₂ (Nitrogen Dioxide):**
- NO₂ also has a V-shaped (or bent) structure due to the presence of one lone pair on the nitrogen atom and two bond pairs. The bond angle is less than 120 degrees.

### Conclusion:
- CO₂ is isostructural with HgCl₂ and C₂H₂ because all three have a linear geometry. Therefore, the correct answer is that CO₂ is isostructural with HgCl₂ and C₂H₂.

### Final Answer:
CO₂ is isostructural with HgCl₂ and C₂H₂.

---