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

Amino acids are classified as acidic, basic or neutral depending upon

1.	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. `(CH_(3))_(2)CH-underset(" "NH_(2))underset(\|)(CH)-COOH`B. `HOOC-CH_(2)-CH_(2)-underset(" "NH_(2))underset(\|)(CH)-COOH`C. `H_(2)N-CH_(2)-CH_(2)-CH_(2)-COOH`D. `HOOC-CH_(2)-underset(" "NH_(2))underset(\|)(CH)-COOH`
Answer» Correct Answer - B::D (b) `HOOC-CH_(2)-CH_(2)-underset(" "NH_(2))underset(\|)(CH)-COOH` Number of COOH group = 2 Number of `NH_(2)` group = 1 Since, number of `COOH` groups `(2) gt` number of `NH_(2)` group (1). Thereofore this amino acid is acidic amino acid. (d) `HOOC- CH_(2)-underset(" "NH_(2))underset(\|)(CH)-COOH` Number of `COOH` groups = 2 Number of `NH_(2)` groups=1 Since, Number of `COOH` groups `(2) gt` Number of `NH_(2)` groups (1). Therefore, amino acid is acidic. While other two are neutral amino acid as number of `NH_(2)` group in equal to number of `COOH` group in then.