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-p-Block elements - I — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
The repeating unit in silicone is
  • 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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