$\begin{array}{*{20}{c}} {C{H_3}}\\ {|\,\,\,\,\,}\\ {{C_6}{H_5}C{H_2} - C - C{H_2} - C{H_3}}\\ {|\,\,\,\,\,}\\ {Br\,\,\,} \end{array}$ $\xrightarrow[{{C_2}{H_5}OH}]{{{C_2}{H_5}ONa}}$