Question:
Alanine forms Zwitter ion which exists as
Alanine forms Zwitter ion which exists as
Show Hint
Amino acids exist as zwitter ions near their isoelectric pH.
Updated On: Apr 23, 2026
- A
- B
- C
- D
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Formula / Definition}
\[ \text{Zwitter ion} = \text{Dipolar ion with } \mathrm{NH_3^+} \text{ and } \mathrm{COO^-} \]
Step 2: Calculation / Simplification}
Zwitter ion exists at isoelectric point (around pH \(\approx 6\)).
Among the given options, pH = 4 is closest to the condition where dipolar ion form is significant.
Thus, alanine exists predominantly as zwitter ion in this medium.
Step 3: Final Answer
\[ \text{Option (B)} \]
\[ \text{Zwitter ion} = \text{Dipolar ion with } \mathrm{NH_3^+} \text{ and } \mathrm{COO^-} \]
Step 2: Calculation / Simplification}
Zwitter ion exists at isoelectric point (around pH \(\approx 6\)).
Among the given options, pH = 4 is closest to the condition where dipolar ion form is significant.
Thus, alanine exists predominantly as zwitter ion in this medium.
Step 3: Final Answer
\[ \text{Option (B)} \]
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