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चलावयव
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thumb|368 px|alt=An amino acid, which shown in two ionization states. First, it is shown in the same arrangement as the lead image. This is the unionised form. It is also shown in the ionized form, after the carboxyl group has lost a hydrogen atom, which introduces a negative charge, and the amino group has gained a hydrogen, which introduces a positive charge.| Two tautomers of an amino acid: (1) neutral and (2) zwitterionic forms.
कार्बनिक यौगिकों के उन संरचनात्मक समावयवों को चलावयव (Tautomers) कहते हैं जो आसानी से परस्पर परिवर्तित हो जाते हैं। Antonov L Tautomerism: Methods and Theories 1st Wiley-VCH Weinheim 2013 978-3-527-33294-6Smith MB, March J Advanced Organic Chemistry https://archive.org/details/organicchemistry00mich_115 5th Wiley Interscience New York 2001 1218–1223 0-471-58589-0Katritzky AR, Elguero J Alan R. Katritzky The Tautomerism of heterocycles Academic Press New York 1976 0-12-020651-X etal registration https://archive.org/details/tautomerismofhet0000unse इस क्रिया में अधिकतर प्रोटॉन का पुनर्विन्यास होता है। यद्यपि यह एक जटिल कॉन्सेप्ट है किन्तु चलावयवता अमीनो अम्लों एवं न्युक्लिक अम्लों]] के सन्दर्भ में बहुत महत्व रखती है क्योंकि दोनों ही जीवन के मूलभूत निर्माण-इकाई हैं।
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श्रेणी:समावयवता