c
\(\begin{array}{*{20}{c}}
  {\,\,\,O} \\ 
  {\,\,\,||} \\ 
  {C{H_3} - C - OH} 
\end{array}\) \(\xrightarrow[{{\text{ Reduction }}}]{{LiAl{H_4}}}{\text{C}}{{\text{H}}_3} - {\text{C}}{{\text{H}}_2} - {\text{OH}}\) \(\xrightarrow{{{\text{PC}}{{\text{l}}_5}}}{\text{C}}{{\text{H}}_3} - {\text{C}}{{\text{H}}_2} - {\text{Cl}}\)  \(\xrightarrow[{{\text{ Dehydrohalogenation }}}]{{{\text{Alc}}.{\text{KOH}}}}\) \(\mathrm{CH}_{2}=\mathrm{CH}_{2}\) (Ethylene)