Chemistry - Biomolecules Question with Solution | TestHub

Question Explanation:

The question asks to compare the acidic and basic strength of amino acids with that of a typical amine and a carboxylic acid.

Concept :

This question is based on Zwitterion Formation and Acid-Base Strength.

Solution :

In zwitterionic form ( ${\mathrm{NH}}_3{}^{+}-\mathrm{CHR}-{\mathrm{COO}}^{-}$), the ${\mathrm{NH}}_3{}^{+}$group can donate ${\mathrm{H}}^{+}$and thus acts as an acid, while the ${\mathrm{COO}}^{-}$group can accept ${\mathrm{H}}^{+}$and acts as a base. Due to mutual inductive and electrostatic effects, ${\mathrm{NH}}_3{}^{+}$is less acidic than a typical - COOH group and ${\mathrm{COO}}^{-}$is less basic than a typical $-{\mathrm{NH}}_2$ group. Hence, both acidic and basic strengths are reduced compared to free functional groups.

Final Answer: Option (B)