Which of the following pairs are tautomers?

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(A, C) Tautomerism is a special type of functional isomerism where isomers exist in dynamic equilibrium due to the migration of a proton.$(A)$ The str

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(A, C) Tautomerism is a special type of functional isomerism where isomers exist in dynamic equilibrium due to the migration of a proton.$(A)$ The structures shown in image $826-a716$ represent an enol and a keto form,which are tautomers.$(B)$ $CH_2=CH-CH_2-OH$ (Allyl alcohol) and $CH_3-CH_2-CHO$ (Propanal) are functional isomers.$(C)$ The structures shown in image $826-c716$ (Anthracene$-9,10-$diol and Anthracene$-9,10-$dione) are also tautomers.$(D)$ $CH_3-C(=O)-C(=O)-CH_3$ and $CH_3-C(OH)=C(OH)-CH_3$ are not isomers because they have different molecular formulas ($C_4H_6O_2$ and $C_4H_8O_2$ respectively).Note: Both $(A)$ and $(C)$ represent tautomeric pairs.

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