Question

Under hydrolytic condition, the compounds used for preparation of linear polymer and for chain termination, respectively, are:

• A. $C{H}_{3}SiC{l}_3$ and $Si(C{H}_3{)}_4$
• B. $(C{H}_3{)}_{2}SiC{l}_2$ and $(C{H}_3{)}_{3}SiCl$
• C. $(C{H}_3{)}_{2}SiC{l}_2$ and $C{H}_{3}SiC{l}_3$
• D. $SiC{l}_4$ and $(C{H}_3{)}_{3}SiCl$

Answer 1

Answer: (B)

$(C{H}_3{)}_{2}SiC{l}_2$ and $(C{H}_3{)}_{3}SiCl$

Answer:- ${\left(C{H}_3\right)}_{2}Si{Cl}_2$ and ${\left(C{H}_3\right)}_{3}SiCl$

Under hydrolytic conditions, the compound used for the preparation of linear polymer and for chain termination are ${\left(C{H}_3\right)}_{2}Si{Cl}_2$ and ${\left(C{H}_3\right)}_{3}SiCl$ respectively.

The hydrolysis of dimethyldichlorosilane produces dimethyl silane diol which on condensation polymerization forms a linear polymer.

The hydrolysis of trimethylchlorosilane produces trimethyl silanol which cannot undergo polymerization as it contains only one -OH group. Hence, it is used for chain termination.