Amino acids are classified as acidic, basic or neutrl depending upon the relative number of amino and carboxyl groups in their molucule. Which of the following are acidic?
(a) $(C H_{3}) C H - C H | N H_{2} - C O O H$
(b) $H O O C - C H_{2} - C H_{2} - C H | N H_{2} - C O O H$
(c) $H_{2} N - C H_{2} - C H_{2} - C H_{2} - C O O H$
(d) $H O O C - C H_{2} - C H | N H_{2} - C O O H$

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Solution

Answers: (b), and (d)

Amino acids with more than one -COOH group one against – NH2 group is acidic in nature.

(b) $H O O C - C H_{2} - C H_{2} - C H | N H_{2} - C O O H$
Number of COOH groups =2
Number of $N H_{2}$ group =1
Since the number of COOH groups (2) > the number of $N H_{2}$ group (1). Therefore, this amino acid is acidic amino acid.
(d) $H O O C - C H_{2} - C H | N H_{2} - C O O H$
Number of COOH group =2
Number of $N H_{2}$ groups =1
Since, Number of COOH groups (2) > Number of $N H_{2}$ groups (1). Therefore, amino acid is acidic. While other two are neutral amino acid as number of $N H_{2}$ group in equal to number of COOH group in then.

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