c
\(\begin{array}{*{20}{c}}
  {\,\,\,C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,C{H_2}OH} 
\end{array}\,\xrightarrow[{ - 2{H_2}O}]{{KHS{O_4},\,225{}^ \circ C}}\begin{array}{*{20}{c}}
  {C{H_2}\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,} \\ 
  {C\,\,\,\,\,\,\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,\,\,CHOH} 
\end{array}\,\, \to \,\begin{array}{*{20}{c}}
  {C{H_2}\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,} \\ 
  {CH\,\,\,\,\,} \\ 
  {||\,\,\,\,\,\,\,\,} \\ 
  {\,CHO} 
\end{array}\)

                                      (અસ્થાયી)એક્રલિન