The major product '$B$' is

$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,C{H_3}}\\
{\,\,\,|\,\,}\\
{C{H_3} - C{H_2} - CH - C - N{H_2}}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||}\\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,}
\end{array}$ $\xrightarrow[\Delta ]{{B{r_2}/KOH}}\left( A \right)\xrightarrow{\begin{subarray}{l} 
  (1)\,\,C{H_3}I\,{\text{(excess)}} \\ 
  (2)\,AgOH/\Delta \, 
\end{subarray} }$ $(B)$

  • A$CH_3-CH_2-CH = CH_2$
  • B

  • C$CH_3-CH = CH -CH_3$
  • D

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