Which of the following species have two types of C-C covalent bond length data

Options

A. diamond
B. graphite
C. Fullerene
D. None of these

Answer

To determine which of the following species have two types of C-C covalent bond lengths, we will analyze each option provided.

### Step-by-Step Solution:

**Step 1: Analyze Diamond**
- Diamond is a covalent crystal with a tetrahedral structure.
- Each carbon atom in diamond is sp³ hybridized and forms four single covalent bonds with four other carbon atoms.
- All C-C bonds in diamond are single bonds, resulting in only one type of C-C bond length.
- **Conclusion:** Diamond does not have two types of C-C bond lengths.

**Step 2: Analyze Graphite**
- Graphite has a layered structure where each carbon atom is bonded to three other carbon atoms in a planar hexagonal arrangement.
- Within each layer, the C-C bonds are covalent bonds, while the layers are held together by weak van der Waals forces.
- The C-C bonds within the hexagonal layers are one type, while the interaction between the layers represents a different type of bonding (non-covalent).
- **Conclusion:** Graphite has two types of C-C bond lengths: one for the covalent bonds within the layers and another for the interactions between the layers.

**Step 3: Analyze Fullerene**
- Fullerenes consist of carbon atoms arranged in a hollow spherical shape, primarily based on hexagonal and pentagonal rings.
- The structure of fullerenes features only one type of covalent bond (the bonds between carbon atoms).
- **Conclusion:** Fullerenes do not have two types of C-C bond lengths.

### Final Answer:
The species that have two types of C-C covalent bond lengths is **Graphite** (Option 2).

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