Draw the structures of two forms of alanine having pH 2 and pH 10.

Q.5 Draw the structures of two forms of alanine having pH 2 and pH 10.

Doubtly Asked 28 Oct 2026 Board exam · June 2026 hsc 12th Save WhatsApp Report

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At pH 2 (acidic medium) – cationic form: the –COO^– of the zwitterion takes up H⁺:

CH₃–CH(N⁺H₃)–COOH

At pH 10 (basic medium) – anionic form: the –N⁺H₃ loses H⁺:

CH₃–CH(NH₂)–COO^–

[In both, the central α-carbon carries H, CH₃, the amino group and the carboxyl group.] At the isoelectric point (about pH 6) alanine exists as the zwitterion CH₃–CH(N⁺H₃)–COO^–.

Doubtly AI · 28 Oct 2026 AI-verified · Oct 2026 Report

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Draw the structures of two forms of alanine having pH 2 and pH 10.

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