$(1)$ $CH_3CH_2-CH_2-OH$
$(2)$ $\begin{array}{*{20}{c}}
{C{H_3} - C{H_2} - CH - OH} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$
$(3)$ $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
\,\,\,\,\,\,|
\end{array}} \\
{C{H_3} - C{H_2} - C - OH} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}$
\(\begin{matrix}
\begin{matrix}
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\,C{{H}_{3}} \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\,| \\
\end{matrix} \\
C{{H}_{3}}-C{{H}_{2}}-{{C}^{\oplus }} \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\ \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\,| \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\, \,\,\,\,C{{H}_{3}} \\
\end{matrix}\) \(>\) \(\begin{array}{*{20}{c}}
{C{H_3} - C{H_2} - CH - O{H^ \oplus }} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}}
\end{array}\) \(>\) \(C{H_3} - C{H_2} - C{H_2} - O{H^ \oplus }\)
${CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{Br} \xrightarrow[\Delta]{\mathrm{KOH}_{(a k)}} \mathrm{A} \xrightarrow{\mathrm{HBr}} \mathrm{B} \xrightarrow[\mathrm{KOH}_{(a) i}]{\Delta} \mathrm{C}$