Number of `pi`-bonds in naphthalene is

Options

A. 6
B. 3
C. 4
D. 5

Answer

To determine the number of π-bonds in naphthalene, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Naphthalene**:
- Naphthalene consists of two fused benzene rings. Each benzene ring contains a hexagonal arrangement of carbon atoms with alternating single and double bonds.

2. **Identify the Carbon-Carbon Bonds**:
- In naphthalene, there are a total of 10 carbon atoms. The structure can be visualized as having 5 carbon-carbon double bonds.

3. **Count the π-bonds**:
- Each carbon-carbon double bond consists of one σ-bond and one π-bond. Therefore, for each of the 5 double bonds, there is one π-bond.

4. **Calculate the Total Number of π-bonds**:
- Since there are 5 double bonds in naphthalene, the total number of π-bonds is equal to the number of double bonds, which is 5.

5. **Conclusion**:
- Therefore, the number of π-bonds in naphthalene is 5.

### Final Answer:
The number of π-bonds in naphthalene is **5**.

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