Question

Among the following substituted silanes, the one which is used to terminate the process of silicone polymerization on hydrolysis to control its length is

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

Answer 1

The correct option is A $R_{3}SiCl$

Chlorosilanes on hydrolysis give alcohol, which undergo polymerization to give silicones. So if we use trialkyl chlorosilanes, on hydrolysis we will get $R_{3}SiOH$, so no further polymerization will take place. Thus $R_{3}SiCl$ is used to terminate the the process of silicone polymerization.