Question

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?

• A. (ii) and (iv)
• B. (iii) and (iv)
• C. (i) and (ii)
• D. (ii) and (iii)

Answer 1

Answer: (A)

Acidic amino acids are those which have more carboxyl groups as compared to amino groups.
Since (ii) and (iv) have two carboxyl groups versus only one amino group, they are acidic.