MCQ
$\begin{array}{*{20}{c}}
  {C{H_3} - CH - CH = C{H_2} + HBr \to X(product)} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_{3\,\,\,\,\,\,\,\,\,\,\,}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

What is the major product i.e. $X$ in the reaction?

  • A
    $\begin{array}{*{20}{c}}
    {C{H_3} - CH - C{H_2}C{H_2}Br}\\
    {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
    {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
    \end{array}$
  • $\begin{array}{*{20}{c}}
    {\begin{array}{*{20}{c}}
    {Br}\\
    |
    \end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
    {C{H_3} - C - C{H_2} - C{H_3}}\\
    {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
    {C{H_3}\,\,\,\,\,\,\,\,\,}
    \end{array}$
  • C
    $\begin{array}{*{20}{c}}
    {C{H_3} - CH - CH - C{H_3}}\\
    {|\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,}\\
    {C{H_3}\,\,\,\,\,Br\,\,}
    \end{array}$
  • D
    $\begin{array}{*{20}{c}}
    {C{H_2} - CH - C{H_2} - C{H_3}}\\
    {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
    {Br\,\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
    \end{array}$

Answer

Correct option: B.
$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{Br}\\
|
\end{array}\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{C{H_3} - C - C{H_2} - C{H_3}}\\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\
{C{H_3}\,\,\,\,\,\,\,\,\,}
\end{array}$
b
$\begin{array}{*{20}{c}}
  {C{H_3} - CH - CH = C{H_2}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$ $\xrightarrow{{{H^ + }}}$ $\begin{array}{*{20}{c}}
  {C{H_3} - CH - \mathop C\limits^ +  H - C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$ $\xrightarrow{{{H^ + }\,shift}}$ $\begin{array}{*{20}{c}}
  {C{H_3} - \mathop C\limits^ +   - C{H_2} - C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$ $\xrightarrow{{B{r^ - }}}$ $\begin{array}{*{20}{c}}
  {\,Br\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - C - C{H_2} - C{H_3}} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

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