What are silicones ? How are they obtained?

Explanation

Silicones and the organo silicon polymers containing R, SIO-repeating unit.
`to` These are synthetic compounds containing `Si-0-Si`
. Preparation : These are formed by the hydrolysis of chlorosilanes.
`to` Methyl chloride reacts with Silicon at high temperature in presence of copper catalyst to form various types of methyl substituted chlorosilane of formula Mesicly, `MeSICI_(3),Me_(2)sICl_(2),Me_(3)SiCl` with small amount `Me_(4)Si`
`to` Hydrolysis of.dimethyl dichloro silane followed by condensation polymerisation forms a straight chain polymer (silicone) (Me = `CH_(3)` -group).
`2CH_(3)Cl+Si overset(Cu)underset(573K)to(CH_(3))_(2)SiCl_(2)overset(+2H_(2)O)underset(-2HCl)to (CH_(3))_(2)Si(OH)_(2)`