`CO_(2)` has same geometry as .

Options

A. `Hg_(2)Cl_(2)`
B. `NO_(2)`
C. `C_(2)H_(2)`
D. `C_(2)H_(6)`

Answer

To determine which molecule has the same geometry as carbon dioxide (CO₂), we need to analyze the geometry of CO₂ and compare it with the given options.

### Step 1: Identify the geometry of CO₂
- CO₂ consists of one carbon atom double-bonded to two oxygen atoms. The molecular structure can be represented as O=C=O.
- The arrangement of the atoms is linear due to the presence of double bonds and no lone pairs on the central carbon atom.

**Hint:** Remember that the geometry is influenced by the number of bonds and lone pairs around the central atom.

### Step 2: Examine the options provided
1. **H₂Cl₂**: This molecule has a central atom with two chlorine atoms and two hydrogen atoms. The presence of lone pairs on the chlorine atoms leads to a bent shape, not linear.

2. **NO₂**: Nitrogen dioxide has a bent shape due to the presence of a lone pair on the nitrogen atom. Thus, it is not linear.

3. **C₂H₂ (Acetylene)**: This molecule consists of two carbon atoms triple-bonded to each other and each carbon atom is bonded to one hydrogen atom (H-C≡C-H). The geometry is linear because there are no lone pairs on the carbon atoms.

4. **C₂H₆ (Ethane)**: Ethane has a tetrahedral geometry due to the single bonds and the presence of four substituents around each carbon atom.

### Step 3: Compare the geometries
- From the analysis, CO₂ is linear, and the only molecule from the options that is also linear is C₂H₂ (Acetylene).

### Conclusion
The correct answer is that CO₂ has the same geometry as **C₂H₂ (Acetylene)**.

**Final Answer:** C₂H₂ (Acetylene)

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