Which of the following does not give any diffraction bands with X-rays ? 

Options

A. `BaSO_(4)`
B. Graphite
C. diamod
D. Plastic

Answer

To determine which of the following substances does not give any diffraction bands with X-rays, we will analyze each option based on their ability to produce monochromatic radiation, which is essential for X-ray diffraction.

### Step-by-Step Solution:

1. **Understanding X-ray Diffraction**:
- X-ray diffraction occurs when X-rays are scattered by the periodic arrangement of atoms in a crystalline material. For diffraction to occur, the material must have a regular, repeating structure and must interact with monochromatic X-ray radiation.

2. **Analyzing the Options**:
- **B.S.O4 (Barium Sulfate)**:
- B.S.O4 is a crystalline compound and can exhibit diffraction patterns when exposed to X-rays. However, the question specifically asks for the substance that does not give any diffraction bands.
- **Graphite**:
- Graphite is a crystalline form of carbon with a layered structure. It can produce diffraction patterns due to its regular arrangement of atoms.
- **Diamond**:
- Diamond is another crystalline form of carbon, characterized by a tetrahedral lattice structure. It also shows distinct diffraction patterns when subjected to X-rays.
- **Plastic**:
- Plastic is typically an amorphous material, lacking a long-range order in its molecular structure. As a result, it does not produce a regular diffraction pattern with X-rays.

3. **Conclusion**:
- Among the given options, **plastic** does not give any diffraction bands with X-rays due to its amorphous nature, which lacks the periodic structure required for X-ray diffraction. Therefore, the correct answer is **plastic**.

### Final Answer:
**Plastic does not give any diffraction bands with X-rays.**