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JEE Main levelSingle correct optionDifficulty 2 of 3bm256

The amino acid shown has and . What is its isoelectric point?

  1. A7.47
  2. B5.97
  3. C11.94
  4. D3.57

Answer: B

For an amino acid with no ionisable side chain, . The compound is glycine; the other values come from subtracting or adding the pKa values or averaging wrongly.
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