question_answer

A substance forms Zwitter ion. It can have functional groups   AIEEE  Solved  Paper-2002

A) \[-N{{H}_{2}},-COOH\] 

B)           \[-N{{H}_{2}},-S{{O}_{3}}H\]

C) Both (a) and (b)

D)           None of these

Correct Answer: C

Solution :

For the formation of Zwitter ion, basic part and acidic part both should be stronger one. Zwitter ion is a neutral molecule with a positive and a negative electrical charge, though multiple positive and negative charge can be present. A substance can form Zwitter ion, if it has \[-N{{H}_{2}}\] group and \[-COOH\] group as well as if it has \[-N{{H}_{2}}\] group and \[-S{{O}_{3}}H\] group. Zwitter ion formed by \[-N{{H}_{2}}\] group and \[-COOH\] group \[{{H}_{2}}N-\overset{\begin{smallmatrix}  R \\  \,\,| \end{smallmatrix}}{\mathop{C}}\,H-COOH\overset{{}}{leftrightarrows}{{H}_{3}}\overset{+}{\mathop{N}}\,-\overset{\begin{smallmatrix}  R \\  | \end{smallmatrix}}{\mathop{C}}\,H-\underset{Zwitter\,\,ion}{\mathop{CO{{O}^{-}}}}\,\]                                  Zwitter ion formed by \[-N{{H}_{2}}\] and \[-S{{O}_{3}}H\] group