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MCAT Question A Day - 4/16/13 - Answer!

Tautomers are

A.  different resonance structures of the same compound.
B.  mirror images of each other.
C.  in rapid equilibrium.
D.  always keto and enol forms.

The correct answer is (C). An example is

The acidic H jumps from the —OH group over to the double bond. Another example of tautomers are enamine-imine tautomers.