A) \[{{H}_{3}}\overset{+}{\mathop{N}}\,-C{{H}_{2}}-CO{{O}^{-}}\]
B) \[{{H}_{3}}\overset{+}{\mathop{N}}\,-C{{H}_{2}}-CO{{O}^{-}}\]
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. \[\underset{\begin{smallmatrix} | \\ ^{\oplus }N{{H}_{3}} \end{smallmatrix}}{\mathop{R}}\,-CH-CO{{O}^{-}}\xrightarrow{+{{H}^{+}}}\underset{\begin{smallmatrix} | \\ ^{\oplus }N{{H}_{3}} \end{smallmatrix}}{\mathop{R}}\,-CH-COOH\]
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