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JEE Main levelSingle correct optionDifficulty 2 of 3pb079

In the manufacture of linear silicones, the compound added to limit the chain length is

A $(CH X_{3}) X_{2} SiCl X_{2}$
B $(CH X_{3}) X_{3} SiCl$
C $CH X_{3} SiCl X_{3}$
D $SiCl X_{4}$

Answer: B

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

has only one hydrolysable Cl, so after hydrolysis it can condense at only one end and caps the chain.

CH X_{3} SiCl X_{3}

and

SiCl X_{4}

would cross-link the chains, and

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

extends them.

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