Choose the correct statement about silicones.

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(D) Silicones are organosilicon polymers with the general formula $(R_2SiO)_n$.Statement $A$ is correct: Silicones are hydrophobic and are widely used

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All of these.

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(D) Silicones are organosilicon polymers with the general formula $(R_2SiO)_n$.Statement $A$ is correct: Silicones are hydrophobic and are widely used as antifoaming agents in various industrial processes.Statement $B$ is correct: The direct synthesis of alkylchlorosilanes involves the reaction of silicon with alkyl chlorides in the presence of copper powder as a catalyst at $570 \ K$.Statement $C$ is correct: The chain length of the silicone polymer can be controlled by adding $R_3SiCl$,which acts as a chain terminator by blocking the end of the polymer chain.Since all statements are correct,the correct option is $D$.

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