MCQ
$C{H_3} - C{H_2} - C \equiv CH\mathop {\xrightarrow{R}}\limits_{{H_2}O} $  Butanone, $R$ is
  • $H{g^{ + + }}$
  • B
    $KMn{O_4}$
  • C
    $KCl{O_3}$
  • D
    ${K_2}C{r_2}{O_7}$

Answer

Correct option: A.
$H{g^{ + + }}$
a
(a) It is hydration of alkynes.

$C{H_3} - C{H_2} - C \equiv CH\mathop {\xrightarrow{{H{g^{ +  + }}}}}\limits_{{H_2}O} \mathop {C{H_3} - C{H_2} - \mathop {\mathop C\limits^{||} }\limits^O  - C{H_3}}\limits_{{\text{Butanone}}} $


 

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$\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
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\end{array}$ $\mathop {\begin{array}{*{20}{c}}
  {\,\,\,\,\,C{H_3}} \\ 
  | \\ 
  {C{H_3} - C - C{H_3}} \\ 
  | \\ 
  {\,\,Br} 
\end{array}}\limits_{(A)} $   +   $\mathop {\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - CH - C{H_2} - Br} 
\end{array}}\limits_{(B)} $ 

the percentage yields of the products $(A)$ and $(B)$ are expected to be

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