Benzene ring contains ____ localised `sigma` - and ____localised `pi` -bonds.

Answer

To solve the question regarding the number of localized sigma and pi bonds in a benzene ring, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure of Benzene:**
- Benzene is an aromatic compound with the molecular formula C₆H₆. It consists of six carbon atoms arranged in a ring, with alternating single and double bonds.

2. **Identifying Sigma Bonds:**
- In benzene, each carbon atom forms one sigma bond with a hydrogen atom. Since there are six carbon atoms, this results in:
- 6 carbon-hydrogen (C-H) sigma bonds.
- Additionally, each pair of adjacent carbon atoms forms a sigma bond. There are five carbon-carbon (C-C) sigma bonds in the benzene ring.
- Therefore, the total number of localized sigma bonds is:
- 6 (C-H) + 6 (C-C) = 12 localized sigma bonds.

3. **Identifying Pi Bonds:**
- The double bonds in benzene are represented by pi bonds. However, in benzene, these pi bonds are delocalized due to resonance.
- There are three alternating double bonds in the benzene structure, which means there are three pi bonds.
- These pi bonds are not localized; they are delocalized across the ring structure.

4. **Final Answer:**
- The benzene ring contains **12 localized sigma bonds** and **3 delocalized pi bonds**.

### Summary:
- Benzene ring contains **12 localized sigma bonds** and **3 delocalized pi bonds**.

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