Number of C-C bonds present in anthracene are

Options

A. 5
B. 3
C. 9
D. 7

Answer

To determine the number of carbon-carbon (C-C) bonds present in anthracene, we can follow these steps:

### Step 1: Draw the Structure of Anthracene
Anthracene is a polycyclic aromatic hydrocarbon consisting of three fused benzene rings. To visualize it, we can sketch the structure:

```
C
/ \
C C
/ \
C C
\ /
C---C
/ \
C C
\ /
C---C
/ \
C C
```

### Step 2: Identify the Carbon Atoms
In the structure of anthracene, each vertex of the hexagonal rings represents a carbon atom. Count the number of carbon atoms present in the structure.

### Step 3: Count the C-C Bonds
Now, we need to count the number of carbon-carbon bonds. Each bond between two carbon atoms is a C-C bond.

1. **Between the first and second benzene rings**: 3 bonds
2. **Between the second and third benzene rings**: 3 bonds
3. **Within each benzene ring**: Each benzene ring has 6 carbon atoms and forms 6 C-C bonds, but since they are fused, we need to adjust the count.

### Step 4: Total the C-C Bonds
1. From the three benzene rings, we have:
- 6 bonds from the first ring
- 6 bonds from the second ring
- 6 bonds from the third ring
- Minus the 3 bonds that are shared between the rings.

So, the total number of C-C bonds can be calculated as:
- Total bonds from three rings: \(6 + 6 + 6 = 18\)
- Shared bonds: \(3\)
- Therefore, total C-C bonds = \(18 - 3 = 15\)

### Step 5: Identify Single Bonds
In anthracene, there are alternating single and double bonds due to resonance. However, we are specifically interested in counting the number of single bonds.

After analyzing the structure, we find:
- There are 9 single C-C bonds in total.

### Conclusion
The number of carbon-carbon single bonds present in anthracene is **9**.