Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:
- Statement I is incorrect but Statement II is correct
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
Answer
(4) Statement I is correct but Statement II is incorrect
Solution
Statement I: Correct – as per NCERT, a particular property of amino acids is the ionizable nature of -NH2 and -COOH groups; hence in solutions of different pH the structure of amino acids changes.
Statement II: Incorrect – the zwitterionic form exists at the isoelectric pH (near neutral). In acidic pH the amino acid exists as a cation and in basic pH as an anion.
Answer: (4)