$\begin{array}{*{20}{c}}
{C{H_3}} \\
|\,\,\,\,\,\, \\
{C{H_{_3}} - C - C{H_2}Br} \\
|\,\,\,\,\,\, \\
H\,\,\,\,
\end{array}\,\xrightarrow[{C{H_3}OH}]{{C{H_3}{O^ - }}}$
$I.$ $C H_{3} C H=C H C H_{3}$ (મુખ્ય નીપજ )
$II.$ $C H_{2}=C H C H_{2} C H_{3}$ (ગૌણ નીપજ )