AIIMS 2018 Chemistry Acid-Base Properties Assertion Reason Question
Assertion: Tyrosine behave as a acidic at pH = 7 Reason: pKₐ of phenol is mole than 7.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Tyrosine can act as an acid at pH 7 due to the presence of its phenolic hydroxyl group, which can donate a proton (H⁺), making it behave as an acid. The pKₐ of phenol is indeed greater than 7, indicating that at physiological pH, the phenolic group is more likely to exist in its deprotonated form, supporting the assertion that tyrosine behaves as an acid. Other options are incorrect because option B suggests that the reason is not a correct explanation, which is false; option C states that the assertion is true but the reason is false, which is also incorrect; and option D claims both are false, which is not the case.
Found an issue with this question?