A) \[{{H}_{3}}N-C{{H}_{2}}-CO{{O}^{-}}\]
B) \[{{H}_{3}}N-C{{H}_{2}}-COOH\]
C) \[{{H}_{2}}N-C{{H}_{2}}-COOH\]
D) \[{{H}_{2}}N-C{{H}_{2}}-CO{{O}^{-}}\]
Correct Answer: B
Solution :
At\[pH=4\], an amphoteric Zwitter ion, structure changes into cation when an acid is added to it. \[R-\underset{\begin{smallmatrix} | \\ ^{\oplus }\,N{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-CO{{O}^{-}}\,\xrightarrow{+{{H}^{+}}}\] \[R-\underset{\begin{smallmatrix} | \\ ^{\oplus }\,N{{H}_{3}} \end{smallmatrix}}{\mathop{C}}\,H-COO\]
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