In the classic diad system of tautomerism observed in Hydrogen Cyanide (), between which two atomic position numbers does the delocalization of the mobile hydrogen atom occur?

Question

In the classic diad system of tautomerism observed in Hydrogen Cyanide ($HCN \rightleftharpoons HNC$), between which two atomic position numbers does the delocalization of the mobile hydrogen atom occur?

Prashant Kotian · Accepted Answer

Correct answer: 2. In a diad system of tautomerism, the hydrogen atom oscillates directly between two adjacent polyvalent atoms. In , the hydrogen shifts from the carbon (position 1) to the nitrogen (position 2), forming an isocyanide. Therefore, the migration happens across exactly 2 atomic positions.

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