JEE Advanced 2015 · Paper 2 · Chemistry Q34

ChemistryMultiple correct+4 / -2Question 34 of 60

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

\ce{CH3SiCl3}

and

\ce{Si(CH3)4}

\ce{(CH3)2SiCl2}

and

\ce{(CH3)3SiCl}

\ce{(CH3)2SiCl2}

and

\ce{CH3SiCl3}

\ce{SiCl4}

and

\ce{(CH3)3SiCl}

Answer and worked solution

Official answer: B

Chains. Hydrolysis of $\ce{(CH3)2SiCl2}$ gives $\ce{(CH3)2Si(OH)2}$ , which condenses into linear $\ce{-[Si(CH3)2O]-}$ chains.
Chain ends. $\ce{(CH3)3SiCl}$ has only one reactive site, so it caps a chain.

(B)

Topics:Silicates and silicones

JEE Advanced 2015 · Paper 2, Chemistry question 34