$(i)\,\,C{H_3} - C{H_2} - C{H_2} - C{H_2} - C{H_2} - OH$

$(ii)\,\,\begin{array}{*{20}{c}}
  {\,C{H_3} - C{H_2} - CH - C{H_2}OH} \\ 
  {\,\,\,\,|} \\ 
  {\,\,\,\,\,\,\,\,\,\,\,C{H_3}} 
\end{array}$

$(iii)\,\,\begin{array}{*{20}{c}}
  {\,C{H_3} - CH - C{H_2} - C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} 
\end{array}$

$(iv)\,\,\begin{array}{*{20}{c}}
  {\,\,C{H_3}\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - C - C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3}\,\,} 
\end{array}$