\(\begin{matrix}
C{{H}_{3}}-CH-{{(C{{H}_{2}})}_{3}}-CHO\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{O}_{2}}H\,\,\,\,\,\,\,\,\,\,(A) \\
\end{matrix}\,\,\,\,\begin{matrix}
C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-CHO \\
(B) \\
\end{matrix}\)
${\left( {C{H_3}} \right)_3}C - CH = C{H_2}\xrightarrow[{\left( {ii} \right)\,NaB{H_4} + NaOH}]{{\left( i \right)\,Hg{{\left( {C{H_3}COO} \right)}_2};\,THF}}\,?$