$\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - C - N{H_2}\xrightarrow[\Delta ]{{B{r_2} + KOH}}C{H_3} - N{H_2}} 
\end{array}$

Intermediates of the reaction is/are

  • A$\begin{array}{*{20}{c}}
      {O\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {||\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {C{H_3} - C - NH - Br} 
    \end{array}$ and $CH_3-CH_2-N=C=O$
  • B$\begin{array}{*{20}{c}}
      {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {C{H_3} - C - Br} 
    \end{array}$ and $CH_3-N=C=O$
  • C$\begin{array}{*{20}{c}}
      {O\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {||\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {C{H_3} - C - NH - Br} 
    \end{array}$ and $CH_3-N=C=O$
  • D$\begin{matrix}
       \,\,O\,  \\
       \,||  \\
       C{{H}_{3}}-C-\overset{\centerdot \,\centerdot }{\mathop{N:}}\,  \\
    \end{matrix}$ and $\begin{array}{*{20}{c}}
      {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
      {C{H_3} - C - Br} 
    \end{array}$
Difficult
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