Which of the following is not an example of tautomeric equilibrium?
- A$H_2C=CH-CH=O \rightleftharpoons C^+H_2-CH=CH-O^-$
- B$Ph-N=N-NH_2 \rightleftharpoons Ph-NH-N=NH$
- C$CH_3-N=O \rightleftharpoons CH_2=N-OH$
- D$Ph-NH-CH=O \rightleftharpoons Ph-N=CH-OH$
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