$CH_2OH-CHI-CH_2OH$

$\begin{array}{*{20}{c}}
  {\,\,C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {CHOH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {\,\,C{H_2}OH} 
\end{array}\, + \,3HI\,\xrightarrow{{ - {H_2}O}}\,\begin{array}{*{20}{c}}
  {\,\,C{H_2}OH} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {CH - I} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {CHO\,\,\,\,} 
\end{array}\,\xrightarrow{{{I_2}}}\,\begin{array}{*{20}{c}}
  {\,\,\,C{H_2}} \\ 
  {||\,\,\,} \\ 
  {CH} \\ 
  |\,\,\, \\ 
  {\,\,\,\,\,\,C{H_2}I} 
\end{array}\,\xrightarrow{{HI}}\,$

(અસ્થાયી) એલાઈલ                (અસ્થાયી) પ્રોપીલીન આયોડાઈડ

$\begin{array}{*{20}{c}}
  {\,\,\,C{H_2}} \\ 
  {||\,\,\,} \\ 
  {CH} \\ 
  |\,\,\, \\ 
  {\,\,\,\,\,C{H_2}I} 
\end{array}\,\xrightarrow{{ - {I_2}}}\begin{array}{*{20}{c}}
  {\,\,\,C{H_3}} \\ 
  |\,\,\, \\ 
  {CH} \\ 
  |\,\,\, \\ 
  {\,\,\,C{H_2}} 
\end{array}\,\xrightarrow{{HI}}\,\begin{array}{*{20}{c}}
  {\,\,\,C{H_3\,\,\,\,}} \\ 
  | \,\,\,\,\,\,\,\,\\ 
  {\,\,\,\,CH - I} \\ 
  | \,\,\,\,\,\,\,\,\\ 
  {C{H_2}I} 
\end{array}$

                            આઈસો પ્રોપાઈલ આયોડાઈડ