\(C{H_3}C{H_2}OH\mathop {\xrightarrow{{{I_2}}}}\limits_{NaOH} C{H_3}CHO\mathop {\xrightarrow{{{I_2}}}}\limits_{NaOH} C{I_3}CHO\) \(\xrightarrow[{NaOH}]{{{H_2}O}}CH{I_3} + HCOONa\)
$CH _{3} CH _{2} CH = CH _{2}$ $\xrightarrow[{Rh\,\,catalyst}]{{{H_2}/CO}}$