Q32 / 125 · BITSAT 2018 · Chemistry

The correct statement about silicone is

A
They are ketones with silyl group $({SiH}_{3})$ similar to alkyl, ${({SiH}_{3})}_{2} CO$
B
They are synthetic polymer containing repeated $R_{2} {SiO}_{2} units$ .
Correct answer
C
They are formed by hydrolysis of $R_{2} {SiCl}_{2}$ .
D
All of the above

Solution

Silicones are synthetic organo-silicon polymers containing repeated $R_{2} SiO$ units. Since the empirical formula is same as that of a ketone $(R_{2} CO)$ , the name silicon has been given to these materials. They can be formed by hydrolysis of dichlorosilanes $(R_{2} {SiCl}_{2})$
$R_{2} {SiCl}_{2} + 2 H_{2} O ⟶ R_{2} Si {(OH)}_{2} + 2 HCl$

Hence, the correct answer is option: 'C'.

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