Question

$M{e}_{3}SiCl$ is used during polymerisation of organo silicones because

• A. $M{e}_{3}SiCl$ acts as a catalyst during polymerisation
  
• B. the chain length of organo silicone polymers can be controlled by adding $M{e}_{3}SiCl$
  
• C. $M{e}_{3}SiCl$ improves the quality and yield of the polymer
  
• D. $M{e}_{3}SiCl$ blocks the end terminal of silicone polymer
  

Answer 1

Answer: (B), (D)

$M{e}_{3}SiCl$ blocks the end terminal of silicone polymer



Organo silicone polymers have $(-Si{R}_{2}O-)$ as a repeating unit.

This polymer of silicon is called Silicones.

$(C{H}_3{)}_{2}SiC{l}_2$ on hydrolysis forms

$\left(C{H}_3{)}_{2}Si\right(OH{)}_2$which polymerises to form silicone.



On adding $(C{H}_3{)}_{2}SiCl$ it forms $(C{H}_3{)}_{3}SiOH$

The chain length of the polymer can be controlled by adding $(C{H}_3{)}_{3}Sicl$ which blocks the ends as shown below: