A) the basic group \[-\text{N}{{\text{H}}_{\text{2}}}\]and the acidic group\[-\text{COOH}\]
B) the basic group\[-\text{NH}_{\text{3}}^{\text{+}}\]and the acidic group\[-\text{C}{{\text{O}}_{\text{2}}}\]
C) the basic group \[-\text{CO}_{2}^{-}\]and the acidic group\[-\text{NH}_{\text{3}}^{\text{+}}\]
D) no acidic or basic group
Correct Answer: C
Solution :
Zwitter ion is formed due to the presence of an acidic and basic group in the same molecule of amino acid. In the formation of Zwitter ion the proton from the carbexyl group has been transferred to the amino group and thus a dipolar ion contains both a positive and a negative charge. \[\underset{\text{Amino}\,\text{acid}}{\mathop{R-\overset{N{{H}_{2}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,-COOH}}\,=\underset{\text{Zwitter}\,\text{ion}}{\mathop{R-\overset{\overset{+}{\mathop{N}}\,{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,H-CO{{O}^{-}}}}\,\]
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