Amino acids are classified as acidic, basic or neutral depending upon the relative number of amino and carboxyl groups in their molecule. Which of the following are acidic?

Options

A. `(CH_(3))_(2)CH-underset(NH_(2))underset("| ")("C ")H-COOH`
B. `HOOC-CH_(2)-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH`
C. `H_(2)N-CH_(2)-CH_(2)-CH_(2)-COOH`
D. `HOOC-CH_(2)-underset(NH_(2))underset("| ")("C ")H-COOH`

Answer

B, D

Explanation

These are both acidic in nature.