Which substance is having molecular solid:

Options

A. graphite
B. `C_(60)`
C. gold
D. `Ca_(3)(PO_(4))_(2)`

Answer

To determine which substance is a molecular solid from the given options, we need to understand the characteristics of molecular solids and analyze each option accordingly.

### Step-by-Step Solution:

1. **Understanding Molecular Solids**:
- Molecular solids are composed of molecules held together by intermolecular forces (such as van der Waals forces, hydrogen bonds, etc.), rather than by ionic, covalent, or metallic bonds.

2. **Analyzing the Options**:
- **Option 1: Graphite**:
- Graphite has a giant covalent structure where each carbon atom is bonded to three other carbon atoms through strong covalent bonds. Therefore, it does not qualify as a molecular solid.
- **Conclusion**: Graphite is not a molecular solid.

- **Option 2: C60 (Buckminsterfullerene)**:
- C60, also known as fullerene, consists of 60 carbon atoms arranged in a structure that includes both hexagons and pentagons. The carbon atoms are held together by strong covalent bonds within the molecule, but the molecules themselves are held together by weaker intermolecular forces.
- **Conclusion**: C60 is a molecular solid.

- **Option 3: Gold**:
- Gold is a metal and exists in a metallic bonding structure. It is malleable and ductile, and its atoms are held together by metallic bonds.
- **Conclusion**: Gold is not a molecular solid.

- **Option 4: Calcium Phosphate**:
- Calcium phosphate consists of calcium ions and phosphate ions that are held together by ionic bonds. This structure is characteristic of ionic solids.
- **Conclusion**: Calcium phosphate is not a molecular solid.

3. **Final Answer**:
- Based on the analysis, the only substance that qualifies as a molecular solid is **C60 (Buckminsterfullerene)**.