JEE Main · 2008 · 27 Apr 2008 · Offline · p-Block Elements

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is

(A) $R_{4} Si$
(B) $RSiCl_{3}$ ✓ Correct
(C) $R_{2} SiCl_{2}$
(D) $R_{3} SiCl$

Answer: (B)

Solution

A cross-linked silicone network needs a silane that can form

Si - O - Si

links in more than two directions, which requires three hydrolysable chlorines on silicon.

RSiC l_{3}

hydrolyses to a silicon bearing three

Si - OH

groups, and these condense outward into a three-dimensional network; the tetra-substituted silane has no hydrolysable bond, the dichloride gives only linear chains, and the monochloride only chain ends. So the cross-linked polymer comes from

RSiC l_{3}

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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