Under hydrolysis conditions, the compounds used for preparation of linear polymer and for chain termination, respectively are

Options

A. `CH_(3) SiCI_(3)` and `Si(CH_(3))_(4)`
B. `(CH_(3))_(2) SiCI_(2)` and `(CH_(3))_(3) SiCI`
C. `(CH_(3))_(2) SiCI_(2)` and `CH_(3)SiCI_(3)`
D. `SiCI_(4)` and `(CH_(3))_(3) SiCI`

Answer

B

Explanation

Hydrolysis of dichlorodimethylsilane followed by polymerization yield straight chain or linear polymers

The chain length of polymer can be controlled by adding `(CH_(3)_(3) SiCI` which blocks the ends as shown:
`nHO - underset(CH_(3))underset(|)overset(CH_(3))overset(|)(Si)-OH + CI - underset(CH_(3))underset(|)overset(CH_(3))overset(|)(si) - CH_(3)`