1.

The repeating structural unit is silicone is

Answer»

`SiO_(2)`
`-underset(R ) underset(l)overset(R )overset(|)(SI)-O-`
`overset(R )overset(|)(O)-underset(R )underset(|)(Si)-O-`
`-underset(R )underset(|)overset(|)(S)-O-O-R`

ANSWER :B


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