MCQ
Predict the correct intermediate and product in the following reaction :

${H_3}C - C \equiv CH\,\xrightarrow[{HgS{O_4}}]{{{H_2}O,\,{H_2}S{O_4}}}\,\mathop {Intermediate}\limits_{(A)} \,$$ \to \,\mathop {\Pr oduct}\limits_{(B)} $

  • A
    $A \,: \, \begin{array}{*{20}{c}}
      {{H_3}C - C = C{H_2}} \\ 
      | \\ 
      {OH} 
    \end{array}$     $ B\,\, :\, \begin{array}{*{20}{c}}
      {{H_3}C - C = C{H_2}} \\ 
      | \\ 
      {S{O_4}} 
    \end{array}$
  • B
    $A\,\, :\,\begin{array}{*{20}{c}}
      {{H_3}C - C - C{H_3}} \\ 
      {|\,|} \\ 
      O 
    \end{array}$    $B\,\,:\, H_3C-C=CH$
  • $A \,: \, \begin{array}{*{20}{c}}
      {{H_3}C - C = C{H_2}} \\ 
      | \\ 
      {OH} 
    \end{array}$     $B\,\, :\,\begin{array}{*{20}{c}}
      {{H_3}C - C - C{H_3}} \\ 
      {|\,|} \\ 
      O 
    \end{array}$
  • D
    $ A\,\, :\, \begin{array}{*{20}{c}}
      {{H_3}C - C = C{H_2}} \\ 
      | \\ 
      {S{O_4}} 
    \end{array}$     $B\,\, :\,\begin{array}{*{20}{c}}
      {{H_3}C - C - C{H_3}} \\ 
      {|\,|} \\ 
      O 
    \end{array}$

Answer

Correct option: C.
$A \,: \, \begin{array}{*{20}{c}}
  {{H_3}C - C = C{H_2}} \\ 
  | \\ 
  {OH} 
\end{array}$     $B\,\, :\,\begin{array}{*{20}{c}}
  {{H_3}C - C - C{H_3}} \\ 
  {|\,|} \\ 
  O 
\end{array}$
c
$C{{H}_{3}}-C\equiv CH\xrightarrow[HgS{{O}_{4}}]{{{H}_{2}}O.{{H}_{2}}S{{O}_{4}}}\begin{matrix}
   C{{H}_{3}}-C=C{{H}_{2}}  \\
   |\,\,  \\
   \,\,\,OH  \\
\end{matrix}$ $\xrightarrow{Tautomerism}\begin{matrix}
   CH3-C-C{{H}_{3}}  \\
   ||  \\
   O  \\
\end{matrix}$

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