Question

Which of the following dipolar structure of the amino acid is considered to be more correct ?

• A.
• B.
• C. Both
• D. None

Answer 1

The correct option is A

Consider the parent compound of the species adding $H^{+}to-CO{O}^{-}$, and then observe the relative acidic character of the two - COOH groups keeping in mind that $-\stackrel{+}{N}{H}_3$ group is electron - withdrawing and hence acid strengthening

(-COOH) on $\alpha$ carbon is more acidic due to - 1 effect of $\stackrel{+}{N}{H}_3$.