Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding

1. MeSiCl3 2. Me2SiCl2
3. Me3SiCl 4. Me4Si
 

Hint: Trimethylsilyl chloride is used to control the chain length of silicone

Silicon has a strong tendency to form polymers can be controlled by adding Me3SiCl which block the ends as shown below