In which of the following case, the forms of amino acid and pH is (are) correctly matched ?

Options

A. Alanine : `pH=3, H_(3)overset(+)(N)-underset(CH_(3))underset("| ")("C ")H-COO^(-)`
B. Leucine : `pH=10, H_(2)N-underset(CH_(2)-underset(CH_(3))underset("| ")("C ")H-CH_(3))underset("| ")(CH-COO^(-))`
C. Aspartic acid : `pH = 9, H_(2)N-underset(CH_(2)-COO^(-)" ")underset("| ")(CH-COO^(-))`
D. Lysine : `pH=3, H_(2)overset(+)(N)-underset(CH_(2)CH_(2)CH_(2)CH_(3)overset(+)(N)H_(3))underset("| ")(CH-COOH" ")`

Answer

B, C, D

Explanation

Alanine at PH = 3 (PI = 6.00) exist as cation
Leucine at PH = 10 (PI = 5.98) exist as anion
Aspartic acid PH = 9 (PI = 2.77) exist at anion
Lysine PH = 3 (PI = 9.74) exists as cation