Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate ?

Options

A. `H_3overset+NoversetRoverset(|)CHCO_2H`
B. `H_2N oversetR overset|CHCO_2H`
C. `H_3 overset(+)N oversetRoverset|CH CO_2^(-)`
D. `H_2 N overset(R )overset(|)CHCO_2^(-)`

Answer

A

Explanation

In acidic medium Zwitter ion convert into
`overset(o+)NH_3 - underset(R)underset(|)(CH) - COoverset(Theta)O + H^(o+)to overset(o+)NH_3 - underset(R)underset(|)CH - COOH`