The Zwitter ion among the following is

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(D) Zwitter ion is a dipolar ion that contains both a positively charged group and a negatively charged group within the same molecule,resulting in a

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$R-CH(NH_3^+)-COO^-$

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(D) Zwitter ion is a dipolar ion that contains both a positively charged group and a negatively charged group within the same molecule,resulting in a net neutral charge. In amino acids,the amino group $(-NH_2)$ acts as a base and accepts a proton to become $-NH_3^+$,while the carboxylic acid group $(-COOH)$ acts as an acid and donates a proton to become $-COO^-$. Thus,the structure $R-CH(NH_3^+)-COO^-$ represents the Zwitter ion form of an amino acid.

Amino acid	$pH$ at Isoelectric point
$(Amino \ acid)_{I}$	$6$
$(Amino \ acid)_{II}$	$9.8$
$(Amino \ acid)_{III}$	$3.9$

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