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

C H_{3} S i C l_{3}

and

S i (C H_{3})_{4}

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(C H_{3})_{2} S i C l_{2}

and

(C H_{3})_{3} S i C l

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(C H_{3})_{3} S i C l_{2}

and

C H_{3} S i C l_{2}

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S i C l_{4}

and

(C H_{3})_{3} S i C l

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Solution

The correct option is B $(C H_{3})_{2} S i C l_{2}$ and $(C H_{3})_{3} S i C l$
Under hydrolytic conditions, the compounds used for the preparation of linear polymer and for chain termination are $(C H_{3})_{2} S i C l_{2}$ and $(C H_{3})_{3} S i C l$ respectively.
The hydrolysis of dimethyl dichlorosilane produces dimethyl silane diol which on condensation polymerization forms a linear polymer.
The hydrolysis of trimethyl chlorosilane produces trimethyl silanol which cannot undergo polymerization as it contains only one $- O H$ group.

Hence, it is used for the chain termination.

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