Acidic character of amino acid is due to:
Correct answer: C. -COOH
- A. -NH2
- B. -NH+3
- C. -COOH
- D. -COO-
Explanation
The correct answer is -COOH, which is the carboxylic acid functional group present in amino acids. This group can donate a proton (H+), which is the defining characteristic of acids, thus imparting acidic properties to amino acids.Options -NH2 and -NH+3 are incorrect because they represent amine groups that can accept protons, making them basic rather than acidic. The presence of the basic amino group does not contribute to the acidity of the amino acid.Option -COO- is also incorrect as it represents the deprotonated form of the carboxylic acid. While it is a fundamental part of the amino acid structure, it does not exhibit acidic properties.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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