- Amino acids are

MCQ

$\alpha - $ Amino acids are

A
acidic due to $-COOH$ group and basic due to $-NH_2$ group
✓
acidic due to $-NH_3^+$ group and basic due to $-COO^-$ group
C
neither acidic nor basic.
D
none is true

✓

Answer

Correct option: B.

acidic due to $-NH_3^+$ group and basic due to $-COO^-$ group

b
Amino acids exist as Zwitterions in which acidic character is due to $-\mathrm{NH}_{3}^{+}$ and basic due to $-\mathrm{COO}^{-}$ group.

$\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,\,} \\
{{H_3}\mathop {NCHCOOH}\limits^{ + \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} }
\end{array}$ $\xleftarrow{{acid}}$ $\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,} \\
{{H_3}\mathop {NCHCO{O^ - }}\limits^{ + \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} }
\end{array}$ $\xrightarrow{{base}}$ $\begin{array}{*{20}{c}}
{R\,\,\,\,\,\,\,\,} \\
{|\,\,\,\,\,\,\,\,\,} \\
{{H_2}NCHCO{O^ - }}
\end{array}$