What are silicons ? How are they prepared ? Give one example. What are their uses ?

Explanation

Silicones are organo silicon compounds containing `(R_2Si - O)` as repeating unit. First alkyl or aryl substituted chlorosilanes are prepared. These on hydrolysis followed by condensation, playmerisation gives polymeric silicones. Eg.

This reaction continue to give chain polymers. If water molecule is eliminated from the terminal OH groups of same chain cyclic, silicones are formed.
1) Used in the preparation of silicone rubbers.
2) Used in the preparation of water-proof clothes and papers.
3) Used in the preparation of grease, lubricants in aeroplanes.
4) Used in electrical motors as insulators.
5) Used in paints and enamels.