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Choose the correct statemet i)Silicone...

Choose the correct statemet
i)Silicones are the organo Silicon polumers containing `R_(2)` SiO-repeating unit.
ii)these are synthetic compounds containing Si-O-Si preparation :These are formed by the hydrolysis of chlorosilanes.
iii)Methyl chloride reacts withSilicon at high temperature in presence of copper catalyst to form various types of methyl subsituted chlorosilane of formula `MeSiCl_(2),Me_(2)SiCl_(2),Me_(2)SiCl` With small amount `Me_(4)Si` .

Text Solution

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`to` Silicones are the organo Silicon polymers containing `R_(2)` SiO-repeating unit.
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 substitured chlorosilane of formula `MeSiCl_(2),Me_(2)SiCl_(2),Me_(2)SiCl` With small amount `Me_(4)Si` .
`to` Hydrolysis of dimethyl dichloro silane followed by condensation .Polymerisation forms a stright chain polymer (Silicone)(Me =`CH_(3)` -Group).
`2CH_(3)CV+Sioverset(Cu)underset(573K)to(CH_(3))_(2)SiCl_(2)overset(+2H_(2)O)underset(-2HCl)to(CH_(3))_(2)Si(OH)_(2)`

uses of Silicones:
`to` These are used in surgical and cosmetic plants.
`to` These are used in preparation of Silicons rubbers.
`to` These are used in preparing water proof clothes and papers.
`to` These are used as insularos.
`to` These are used in paints and enamels.
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