Question

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

• A. $R_{2}SiC{1}_2$
• B. $R_{3}SiC1$
• C. $R_{4}Si$
• D. $RSiC{1}_3$

Answer 1

Answer: (D)

$RSiC{1}_3$

Trichlorosilane is the basic ingredient used in the production of purified cross linked silicon polymer. In water, it rapidly decomposes to produce a silicone polymer while giving off hydrochloric acid.

$RSiC{l}_3+H_{2}O\to RSi(OH{)}_3+HCl$

Linear and cyclic silicones are produced by the reaction of water with organochlorosilanes of the general formula, $R_{2}SiC{l}_2$ followed by a polymerization reaction that occurs by the elimination of a molecule of water from two hydroxyl groups of adjacent $R_{2}Si(OH{)}_2$ molecules.