Question

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

Options

• R₄Si

• R₂SiCl₂

• RSiCl₃

• R₃SiCl

Answer 1

RSiCl₃ 

Explanation:

The cross linked polymers will be formed by RSiCl₃

\[\begin{array}{cc}
\phantom{...................}\ce{OH}\phantom{.................}\ce{R}\phantom{........}\ce{R}\phantom{........}\ce{O}\\
\phantom{...................}|\phantom{....................}|\phantom{.........}|\phantom{.........}|\\
\phantom{}\ce{nRSiCl3 ->[3nH2O][-3nHCl] nR - Si - OH -> ...O - Si - O - Si - O - Si - R}\phantom{.}\\
\phantom{...................}|\phantom{....................}|\phantom{.........}|\phantom{.........}|\\
\phantom{...................}\ce{OH}\phantom{.................}\ce{O}\phantom{........}\ce{O}\phantom{........}\ce{O}\\
\phantom{........................................}|\phantom{.........}|\phantom{.........}|\phantom{.}\\
\phantom{.....................................}\ce{...O - Si - O - Si - O - Si - R}\\
\phantom{........................................}|\phantom{.........}|\phantom{.........}|\phantom{.}\\
\phantom{..........................................}\underset{\text{(Cross linked polymer)}}{\ce{R}\phantom{........}\ce{R}\phantom{........}\ce{O}}
\end{array}\]