which of the following bonds is shown in silicones?

Options

A.
B.
C. `O - underset(O)underset(|)overset(O)overset(|)(Si) - O`
D.

Answer

To determine which type of bond is present in silicones, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Silicones**:
- Silicones are polymers that consist of alternating silicon (Si) and oxygen (O) atoms. They have a backbone structure that is primarily made up of these alternating atoms.

2. **Identify the General Formula**:
- The general structural formula for silicones can be represented as R2Si-O-Si-O, where R represents alkyl groups (like methyl groups, -CH3).

3. **Recognize the Bond Types**:
- In silicones, the key bonds are:
- **Silicon-Oxygen Bonds (Si-O)**: These are covalent bonds formed between silicon and oxygen atoms.
- **Silicon-Carbon Bonds (Si-C)**: These occur when alkyl groups are attached to the silicon atoms.

4. **Analyze the Repeating Unit**:
- The repeating unit in silicones can be visualized as a chain of Si-O bonds, with alkyl groups attached to the silicon atoms. This structure repeats to form the polymer.

5. **Conclusion**:
- The primary bonds present in silicones are **Si-O (silicon-oxygen) bonds** and **Si-C (silicon-carbon) bonds**. However, since the question specifically asks about the bonds shown in silicones, the answer is the **Si-O bond**.

### Final Answer:
The bond shown in silicones is the **Si-O (silicon-oxygen) bond**.

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