$\begin{array}{*{20}{c}} O\\ {||}\\ {C{H_3} - C - C{H_3}} \end{array}$ $ + \begin{array}{*{20}{c}} {C{H_2}OH}\\ {\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\\ {C{H_2}OH} \end{array}$ $\overset{HCl}{\longleftrightarrow}$ ?