Which of the following given list has molecular solids only?

Options

A. Carborundum, dry ice, diamond, solid H_2, benzene
B. Naphthalene, `Na_2 SO_4` copper, corundum, `CCI_4`
C. Corundum, camphor, silicon carbide, ice, solid CS_2
D. Solid `H_2`, camphor, dry ice, `solid CS_2`, naphthalene

Answer

To determine which of the given lists contains only molecular solids, we need to analyze each option and identify the nature of the solids present in each list. Molecular solids are composed of molecules held together by Van der Waals forces.

### Step-by-Step Solution:

1. **Understanding Molecular Solids**:
- Molecular solids are formed from molecules that are held together by weak intermolecular forces, such as Van der Waals forces. Examples include substances like dry ice (CO2) and naphthalene.

2. **Analyzing List A**:
- **Carborundum (SiC)**: This is a covalent network solid, not a molecular solid.
- **Dry Ice (CO2)**: This is a molecular solid.
- **Diamond**: This is also a covalent network solid, not a molecular solid.
- **Conclusion for A**: Contains non-molecular solids.

3. **Analyzing List B**:
- **Naphthalene (C10H8)**: This is a molecular solid.
- **Na2SO4**: This is an ionic solid, not a molecular solid.
- **Copper (Cu)**: This is a metallic solid, not a molecular solid.
- **Conclusion for B**: Contains non-molecular solids.

4. **Analyzing List C**:
- **Corundum (Al2O3)**: This is an ionic solid, not a molecular solid.
- **Camphor (C10H16O)**: This is a molecular solid.
- **Silicon Carbide (SiC)**: This is a covalent network solid, not a molecular solid.
- **Ice (H2O)**: While ice is a solid form of water, it is a molecular solid.
- **Conclusion for C**: Contains non-molecular solids.

5. **Analyzing List D**:
- **Solid H2**: This is a molecular solid.
- **Camphor (C10H16O)**: This is a molecular solid.
- **Dry Ice (CO2)**: This is a molecular solid.
- **Solid CS2 (Carbon Disulfide)**: This is a molecular solid.
- **Naphthalene (C10H8)**: This is a molecular solid.
- **Conclusion for D**: All substances listed are molecular solids.

6. **Final Conclusion**:
- The only list that contains only molecular solids is **List D**.