$\,\begin{array}{*{20}{c}}
{C{H_3}C{H_2}} \\
{C{H_3}C{H_2}}
\end{array} > C < \begin{array}{*{20}{c}}
{OMgBr} \\
{C{H_2}C{H_3}}
\end{array}\xrightarrow{{{H_2}O/{H^ + }}}$
$\begin{array}{*{20}{c}}
{\,\,\,\,OH} \\
| \\
{C{H_3}C{H_2} - C - C{H_2}C{H_3}} \\
| \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}C{H_3}}
\end{array}\, + \,Mg(OH)Br$
$C{H_3}C{H_2}OH\xrightarrow{{P + {I_2}}}A\xrightarrow[{ether}]{{Mg}} $ $B\xrightarrow{{HCHO}}C\xrightarrow{{{H_2}O}}D$
ઉપરની પ્રક્રિયા પરથી નીપજ $"A"$ અને $"B"$ રચાય છે,તે $"A"$ અને $"B"$ શોધો.