Alanine, at its isoelectric point, exists in solution as :
A
H2NCHCOO⊖|CH3
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B
H3⊕NCHCOOH|CH3
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C
H3⊕NCHCOO⊖|CH3
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D
H2NCHCOOH|CH3
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Solution
The correct option is CH3⊕NCHCOO⊖|CH3 The isoelectronic point or isoionic point is the pH at which the amino acid does not migrate in an electric field. This means it is the pH at which the amino acid is neutral, i.e. the zwitterion form is dominant. So Alanine exits as given in the figure.