$\begin{matrix}
\underset{X}{\mathop{H}}{{O}_{2}}C-C{{H}_{2}}-CH-C{{O}_{2}}\underset{Z}{\mathop{H}}\, \\
\,\,\,\,\,\,\,\,\,\,\,| \\
\,\,\,\,\,\,\,\,\,\,\,\,\,+N{{H}_{3}} \\
\end{matrix}$
The isoelectric point for the amino acid is
$(A)$ Glucose $(B)$ Gulose
$(C)$ Fructose $(D)$ Maltose
$(E)$ Mannose
$STATEMENT-2$: Reaction of glucose with Fehling's solution gives $\mathrm{CuO}$ and gluconic acid.