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NEET levelSingle correct optionDifficulty 1 of 3pb076

The repeating unit of a linear silicone polymer made from dimethyldichlorosilane is

A $(CH X_{3}) X_{3} SiO$
B $(CH X_{3}) X_{2} SiCl$
C $(CH X_{3}) X_{2} SiO$
D $CH X_{3} SiO X_{1.5}$

Answer: C

Hydrolysis of

(CH X_{3}) X_{2} SiCl X_{2}

gives

(CH X_{3}) X_{2} Si (OH) X_{2}

, which loses water on condensation to give the chain

- [(CH X_{3}) X_{2} SiO] X_{n} X^{-}

. The repeating unit is therefore

(CH X_{3}) X_{2} SiO

.

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