in compound `X` all the bond angles around central atom are `109^(@)28'` one of the following will be `X` ? .

Options

A. Chloromethane
B. Carbon tetrachloride
C. lodoform
D. Chloroform

Explanation

To determine which compound `X` has bond angles of `109° 28'`, we need to analyze the options provided. The bond angle of `109° 28'` is characteristic of a tetrahedral geometry, which is typically associated with sp³ hybridization.

### Step-by-Step Solution:

1. **Understanding Tetrahedral Geometry**:
- The tetrahedral geometry occurs when a central atom is bonded to four other atoms with no lone pairs. In this arrangement, the bond angles are ideally `109.5°`, which is very close to `109° 28'`.

2. **Analyzing the Options**:
- **Option 1: Chloromethane (CHCl₃)**:
- This molecule has one hydrogen and three chlorine atoms. The presence of different electronegativities (H and Cl) leads to bond angle distortion, making it deviate from `109° 28'`.
- **Option 2: Carbon Tetrachloride (CCl₄)**:
- This molecule has four chlorine atoms bonded to a carbon atom. Since all the surrounding atoms are the same, it maintains a perfect tetrahedral shape with bond angles of `109° 28'`.
- **Option 3: Iodoform (CHI₃)**:
- This molecule has one iodine and three hydrogen atoms. The difference in electronegativity between iodine and hydrogen will cause bond angle distortions, moving it away from `109° 28'`.
- **Option 4: Chloroform (CHCl₃)**:
- Similar to chloromethane, it has one hydrogen and three chlorine atoms. The difference in electronegativity will also distort the bond angles.

3. **Conclusion**:
- Among the given options, **Carbon Tetrachloride (CCl₄)** is the only compound that has a perfect tetrahedral geometry with bond angles of `109° 28'`.

### Final Answer:
- The compound `X` is **CCl₄ (Carbon Tetrachloride)**.