The compound which is non-linear

Options

A. `CO_2`
B. `CS_2`
C. `HgCl_2`
D. `H_2O`

Explanation

To determine which compound is non-linear among the given options (CO2, CS2, HgCl2, and H2O), we will analyze the molecular geometry of each compound.

### Step 1: Analyze CO2
- **Structure**: CO2 consists of one carbon atom double bonded to two oxygen atoms (O=C=O).
- **Geometry**: The arrangement of the atoms is linear, with a bond angle of 180 degrees.
- **Conclusion**: CO2 is linear.

### Step 2: Analyze CS2
- **Structure**: CS2 consists of one carbon atom double bonded to two sulfur atoms (S=C=S).
- **Geometry**: Similar to CO2, the arrangement is linear with a bond angle of 180 degrees.
- **Conclusion**: CS2 is linear.

### Step 3: Analyze HgCl2
- **Structure**: HgCl2 consists of one mercury atom bonded to two chlorine atoms (Cl-Hg-Cl).
- **Geometry**: The arrangement is also linear with a bond angle of 180 degrees.
- **Conclusion**: HgCl2 is linear.

### Step 4: Analyze H2O
- **Structure**: H2O consists of one oxygen atom bonded to two hydrogen atoms (H-O-H).
- **Geometry**: The oxygen atom has two lone pairs of electrons, which causes repulsion between the lone pairs and the bond pairs, resulting in a bent or angular shape.
- **Conclusion**: H2O is non-linear.

### Final Conclusion
Among the compounds CO2, CS2, HgCl2, and H2O, the only non-linear compound is **H2O**.

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