State true or false :
Silicones repel water due to: The presence of alkyl group pointed towards surface

Explanation

To determine whether the statement "Silicones repel water due to the presence of alkyl group pointed towards surface" is true or false, we can analyze the properties of silicones and their structure.

### Step-by-Step Solution:

1. **Understanding Silicones**: Silicones are synthetic polymers made up of alternating silicon and oxygen atoms, with organic groups (such as alkyl groups) attached to the silicon atoms.

2. **Structure of Silicones**: The general structure of silicones can be represented as a chain of Si-O bonds, where the silicon atoms are bonded to organic groups. These organic groups can be alkyl groups, which are hydrophobic in nature.

3. **Hydrophobic Nature**: Alkyl groups are non-polar and do not interact favorably with water, which is polar. This non-polar characteristic contributes to the hydrophobic (water-repelling) properties of silicones.

4. **Orientation of Alkyl Groups**: When the alkyl groups are oriented towards the surface of the silicone material, they create a barrier that prevents water molecules from coming into contact with the silicone polymer chain. This orientation enhances the water-repelling ability of the silicone.

5. **Conclusion**: Since the presence of alkyl groups pointing towards the surface contributes to the water-repelling properties of silicones, the statement is **True**.

### Final Answer:
**True**: Silicones repel water due to the presence of alkyl groups pointed towards the surface.

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