The repeating unit in silicone is

MCQ

A
$SiO_2$
✓
$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{ - Si - {O^ - }} \\
{|\,\,\,\,\,\,\,\,\,\,} \\
{R\,\,\,\,\,\,\,\,\,}
\end{array}$
C
$\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,} \\
{O - Si - {O^ - }} \\
| \\
R
\end{array}$
D
$\begin{array}{*{20}{c}}
{\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{ - Si - O - O - R} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{R\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

✓

Answer

Correct option: B.

$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,}
\end{array}} \\
{ - Si - {O^ - }} \\
{|\,\,\,\,\,\,\,\,\,\,} \\
{R\,\,\,\,\,\,\,\,\,}
\end{array}$

b
Polymeric organosilicon compounds containing $Si-O-Si$ bonds are called silicones. Silicones have general formula $(R_2SiO)_n$. Hence repeating unit of silicone is $R_2SiO^ -$.

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