We draw resonance contributors connected with one double-headed arrow, but we dr

Question

We draw resonance contributors connected with one double-headed arrow, but we draw tautomers connected by a pair of arrows (forward and reverse). This distinction is made because: A1. There may be more than one resonance contributor, but there will only be two tautomers. A2. No new bonds are formed in converting between two resonance contributors. A3. No nuclei are in different places when comparing two resonance contributors. A4. Tautomerization is only reversible in special cases. A5. None of the above is a valid reason.

Explanation / Answer

in resonance we draw a double headed arrow to show that both structures are equivalents and same. while in tautomerism we draw forward and backward arrow because tautomer exist with it mains structure at equilibrium, however the concentration of main compound and its tautomer can be different depending on which of them is more stable. so none of the above is valid

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