question_answer

    At\[pH=4,\]glycine exists as

A)  \[{{H}_{3}}\overset{+}{\mathop{N}}\,C{{H}_{2}}CO{{O}^{-}}\]

B)  \[{{H}_{3}}\overset{+}{\mathop{N}}\,C{{H}_{2}}COOH\]

C)  \[{{H}_{2}}NC{{H}_{2}}COOH\]

D)  \[{{H}_{2}}NC{{H}_{2}}CO{{O}^{-}}\]

Correct Answer: B

Solution :

                At\[pH=4,\]an amphoteric Zwitter ion structure changes into cation when an acid is added to it.