$\begin{array}{*{20}{c}}
{\,\,\,\,\,\,C{H_3}} \\
| \\
{C{H_3} - C - OH} \\
| \\
{\,\,\,\,\,\,C{H_3}}
\end{array}\, \to \begin{array}{*{20}{c}}
{\,\,\,C{H_3}} \\
| \,\,\,\,\\
{C{H_3} - {C^ \oplus } - O{H^ - }} \\
| \,\,\,\,\\
{C{H_3}}
\end{array}$
$3^o$ કાર્બોનિયમ આયન
${\left( {C{H_3}} \right)_2}CH - OH\xrightarrow{{PB{r_3}}}X\xrightarrow{{alko.\,\,KOH}}Y\xrightarrow[{(ii)\,{H_3}{O^ + }}]{{(i)\,{H_2}S{O_4}}}Z$