STD 11 - 8.2 Organic chemistry isomerism — JEE STD 11 Science — Question

$\begin{array}{*{20}{c}}
  O \\ 
  {||} \\ 
  {C{H_3} - C{H_2} - C - C{H_2} - C{H_2}} 
\end{array}$

$\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\ 
  {C{H_3} - C{H_2} - C{H_2} - C - N{H_2}} 
\end{array}$