Explanation:
Structure of \(\alpha\)-butyraldehyde is
\(\begin{array}{l}{\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{C}}{{\rm{H}}_{\rm{2}}}{\rm{CH(OH)CHO}}\\\,\,\,\,{\rm{4}}\,\,\,\,\,\,\,{\rm{3}}\,\,\,\,\,\,\,\,{\rm{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{1}}\end{array}\)
IUPAC name: 2-hydroxy butanal