Question
In aqueous solutions, amino acids mostly exist as
A.
$$N{H_2} - CHR - COOH$$
B.
$$N{H_2} - CHR - CO{O^ - }$$
C.
$$\mathop N\limits^ + {H_3}CHRCOOH$$
D.
$${H_3}\mathop N\limits^ + CHRCO{O^ - }$$
Answer :
$${H_3}\mathop N\limits^ + CHRCO{O^ - }$$
Solution :
In aqueous solutions, amino acids mostly exist as zwitter ion or dipolar ion.
\[\underset{\text{zwitter ion}}{\mathop{\overset{+}{\mathop{N}}\,{{H}_{3}}\overset{\begin{smallmatrix}
R\,\,\, \\
|\,\,\,
\end{smallmatrix}}{\mathop{-CH-}}\,CO{{O}^{-}}}}\,\]