What is the relation between diamond and graphite ?

Options

A. Polymorphous
B. Isomer
C. Isotope
D. Isomorphous

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the relationship between diamond and graphite. Both substances are forms of carbon, but they have different properties and structures.

2. **Defining Diamond and Graphite**:
- **Diamond**: Diamond is a crystalline form of carbon where each carbon atom is tetrahedrally bonded to four other carbon atoms. This structure gives diamond its hardness and high refractive index.
- **Graphite**: Graphite, on the other hand, has a layered structure where each carbon atom is bonded to three other carbon atoms in a planar hexagonal arrangement. The layers are held together by weak van der Waals forces, allowing them to slide over each other, which gives graphite its lubricating properties.

3. **Classification**: Both diamond and graphite are classified as **polymorphs** of carbon. Polymorphs are substances that have the same molecular formula but different structural arrangements. In this case, both diamond and graphite have the same molecular formula (C), but their structures and properties differ significantly.

4. **Conclusion**: The relationship between diamond and graphite is that they are polymorphous forms of carbon. This means they exist in different structural forms while having the same chemical composition.

### Final Answer:
Diamond and graphite are two different structural forms of carbon, classified as polymorphs. They have the same molecular formula (C) but different physical structures and properties.

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