NEET · Chemistry · STD 11 -p-Block elements - I
Which of these is not a monomer for a high molecular mass silicone polymer ?
- A \(Me_3SiCl\)
- B \(PhSiCl_3\)
- C \(MeSiCl_3\)
- D \(Me_2SiCl_2\)
Answer & Solution
Correct Answer
(A) \(Me_3SiCl\)
Step-by-step Solution
Detailed explanation
\(Me_3SiCl\) is not a monomer for a high molecular mass silicone polymer because it generates \(Me_3SiOH\) when subjected to hydrolysis which contains only one reacting site. Hence, the polymerization reaction stops just after first step. \(\begin{array}{*{20}{c}}
{Me} \\
| \\
{Me - Si - OH} \\
| \\
{Me}
\end{array}\) \(+\) \(\begin{array}{*{20}{c}}
{Me} \\
| \\
{HO - Si - Me} \\
| \\
{Me}
\end{array}\) \(\xrightarrow[{ - {H_2}O}]{}\) \(\mathop {\begin{array}{*{20}{c}}
{\,\,Me\,\,\,\,\,\,\,\,\,\,\,\,\,Me} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{Me - Si - O - Si - Me} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,Me\,\,\,\,\,\,\,\,\,\,\,\,\,Me}
\end{array}}\limits_{Final\,product\,(\dim er)} \)
{Me} \\
| \\
{Me - Si - OH} \\
| \\
{Me}
\end{array}\) \(+\) \(\begin{array}{*{20}{c}}
{Me} \\
| \\
{HO - Si - Me} \\
| \\
{Me}
\end{array}\) \(\xrightarrow[{ - {H_2}O}]{}\) \(\mathop {\begin{array}{*{20}{c}}
{\,\,Me\,\,\,\,\,\,\,\,\,\,\,\,\,Me} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{Me - Si - O - Si - Me} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,Me\,\,\,\,\,\,\,\,\,\,\,\,\,Me}
\end{array}}\limits_{Final\,product\,(\dim er)} \)
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