JEE Main Chemistry question

[Jamia Millia Islamia 2008] At pH = 4, glycine exists as

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

At pH = 4, well below glycine's isoelectric point (around pH 6), the solution is acidic enough to protonate the carboxylate group back to –COOH while the amino group remains protonated as , giving the overall cationic form

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Question ID VK-150681