Question
The structure of a peptide is given below. If the absolute values of the net charge of the peptide at pH = 2 , pH = 6 , and pH = 11 are z 1 , z 2 , and z 3 , respectively, then what is z 1 + z 2 + z 3 ?
JEE Advanced
Chemistry
Biomolecules
2020
JEE Advanced 2020 (Paper 2)
JEE Advanced Chemistry Question (2020) — Solution
Options
- A. A
- B. B
- C. C
- D. D
Answer
A. A
Step-by-step solution
The structure of tripeptide will be as followed at PH = 2 (in highly acidic medium) hence z 1 = 2 at pH = 6 (in approximately neutral solution it will be Hence z 2 = 0 pH = 11 (in highly basic medium) the structure will be Hence z 3 will be 3 . Therefore z 1 + z 2 + z 3 = 2 + 0 + 3 = 5 .
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