Which one of the following is a Zwitter ion?

Options

A. `""^(+)H_(2)N-underset(R)underset(|)CH-COO^(-)`
B. `NH_(3)-underset(R)underset(|)CH-COO^(+)`
C. `""^(+)H_(3)N-underset(R)underset(|)CH-COO^(-)`
D. `""^(+)H_(4)N-underset(R)underset(|)CH-COO^(-)`

Answer

C

Explanation

Zwitter ion is a "dipolar ion"
`{:("Amino acid"),(H_(2)N-underset(R)underset(|)CH-COOH):}" "{:("Zwitter ion"),(underset(R)underset(|)(""^(+)H_(3)N)-CH-COO^(-)):}`