The $pK_a$ values for the three ionizable groups $X , Y$ and $Z$ of glutamic acid are $4.3, 9.7$ and $2.2$ respectively

$\begin{matrix}
\underset{X}{\mathop{H}}{{O}_{2}}C-C{{H}_{2}}-CH-C{{O}_{2}}\underset{Z}{\mathop{H}}\, \\
\,\,\,\,\,\,\,\,\,\,\,| \\
\,\,\,\,\,\,\,\,\,\,\,\,\,+N{{H}_{3}} \\
\end{matrix}$

The isoelectric point for the amino acid is

Q: The $pK_a$ values for the three ionizable groups $X , Y$ and $Z$ of glutamic acid are $4.3, 9.7$ and $2.2$ respectively $\begin{matrix} \underset{X}{\mathop{H}}{{O}_{2}}C-C{{H}_{2}}-CH-C{{O}_{2}}\underset{Z}{\mathop{H}}\, \\ \,\,\,\,\,\,\,\,\,\,\,| \\ \,\,\,\,\,\,\,\,\,\,\,\,\,+N{{H}_{3}} \\ \end{matrix}$ The isoelectric point for the amino acid is

b $(b)$ in acidic medium $\frac{4.3 + 2.2}{2} = 3.25$

Question

The $pK_a$ values for the three ionizable groups $X , Y$ and $Z$ of glutamic acid are $4.3, 9.7$ and $2.2$ respectively

$\begin{matrix}
\underset{X}{\mathop{H}}{{O}_{2}}C-C{{H}_{2}}-CH-C{{O}_{2}}\underset{Z}{\mathop{H}}\, \\
\,\,\,\,\,\,\,\,\,\,\,| \\
\,\,\,\,\,\,\,\,\,\,\,\,\,+N{{H}_{3}} \\
\end{matrix}$

The isoelectric point for the amino acid is

A$7.00$
B$3.25$
C$4.95$
D$5.95$

Medium

LIST-$I$	LIST-$I$
$A$.Glucose/NaHCO3/$\Delta$	$I$.Gluconic acid
$B$.Glucose/HNO3	$II$. No reaction
$C$.Glucose/HI/ $\Delta$	$III$. n-hexane
$D$. Glucose/Bromine [water]	$IV$. Saccharic acid

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