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8.4. Organic chemistry reaction mechanism — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.4. Organic chemistry reaction mechanism1 Mark
MCQ
Which of the following pairs does not represent resonating structures ?
  • ✓
    $\begin{array}{*{20}{c}}
      O \\ 
      {||} \\ 
      {C{H_3} - C - C{H_3}} 
    \end{array}$ and $\begin{array}{*{20}{c}}
      {OH} \\ 
      | \\ 
      {C{H_3} - C = C{H_2}} 
    \end{array}$
  • B

  • C
    $\begin{array}{*{20}{c}}
      {\mathop {\,\,\,\,\,\,\,\,\,O}\limits^{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \oplus }  - H} \\ 
      {||} \\ 
      {C{H_3} - C - C{H_3}} 
    \end{array}$ and $\begin{array}{*{20}{c}}
      {\,\,\,\,\,OH} \\ 
      | \\ 
      {C{H_3} - \mathop C\limits_ \oplus   - C{H_3}} 
    \end{array}$
  • D
    $CH_2 = C = O$ and $\mathop C\limits^\Theta  {H_2} - C \equiv \mathop O\limits^ \oplus  $
✓

Answer

Correct option: A.
$\begin{array}{*{20}{c}}
  O \\ 
  {||} \\ 
  {C{H_3} - C - C{H_3}} 
\end{array}$ and $\begin{array}{*{20}{c}}
  {OH} \\ 
  | \\ 
  {C{H_3} - C = C{H_2}} 
\end{array}$
a
$\begin{array}{*{20}{c}}
  O \\ 
  {||} \\ 
  {C{H_3} - C - C{H_3}} 
\end{array}$ and $\begin{array}{*{20}{c}}
  {OH} \\ 
  | \\ 
  {C{H_3} - C = C{H_2}} 
\end{array}$ are tautomers

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