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{:("CH=O"),(|),("CH=O"),("Glyoxal"):}und...

`{:("CH=O"),(|),("CH=O"),("Glyoxal"):}underset(Delta)overset(OH^(-))rarrX,X` is

A

`{:(COO^(-)),(|),(CH_(2)O^(-)):}`

B

`{:(COO^(-)),(|),(COO^(-)):}`

C

`{:(COO^(-)),(|),(CH_(2)OH):}`

D

`{:(CH_(2)O^(-)),(|),(CH_(2)O^(-)):}`

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