Which of the following is non-linear molecule

Options

A. `CO_3^(2-)`
B. `CO_2`
C. `CS_2`
D. `BeCl_2`

Explanation

To determine which of the following molecules is non-linear, we need to analyze the molecular geometry of each option provided. Let's consider the common examples of molecules and their geometries.

### Step 1: Identify the Molecules
Let's assume we have the following molecules to analyze:
1. CO2 (Carbon Dioxide)
2. H2O (Water)
3. NH3 (Ammonia)
4. BCl2 (Boron Dichloride)

### Step 2: Determine the Molecular Geometry
- **CO2 (Carbon Dioxide)**:
- CO2 has a linear geometry. The carbon atom is in the center with two oxygen atoms on either side, forming a straight line with a bond angle of 180 degrees.

- **H2O (Water)**:
- H2O has a bent or angular geometry. The oxygen atom is in the center with two hydrogen atoms bonded to it, resulting in a bond angle of approximately 104.5 degrees due to the repulsion of lone pairs.

- **NH3 (Ammonia)**:
- NH3 has a trigonal pyramidal geometry. The nitrogen atom is at the center with three hydrogen atoms bonded to it, and there is one lone pair of electrons, leading to a bond angle of about 107 degrees.

- **BCl2 (Boron Dichloride)**:
- BCl2 has a linear geometry. The boron atom is at the center with two chlorine atoms bonded to it, forming a straight line with a bond angle of 180 degrees.

### Step 3: Identify the Non-Linear Molecule
From the analysis:
- CO2 is linear.
- BCl2 is linear.
- H2O is non-linear (bent).
- NH3 is also non-linear (trigonal pyramidal).

### Conclusion
The non-linear molecules from the options provided are H2O and NH3, but if we need to select one, H2O is a classic example of a non-linear molecule.

### Final Answer
**H2O (Water) is a non-linear molecule.**

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