[CKabes]

Can someone please explain what tautomerism is? Is it simply the movement of a H proton from one atom to another, forming an isomer?

[XGen]

It depends really how in depth you would like to know.

Tautomers are a special form of structural isomers where a proton is moved, accompanied by a switch from a double bond to a single bond or vice versa. An example of this is enol/ketone.

http://en.wikipedia.org/wiki/Tautomer for more information.

[juanrga]

Can someone please explain what tautomerism is? Is it simply the movement of a H proton from one atom to another, forming an isomer?

It is an isomerism of the general form:

G-X-Y=Z   X=Y-Z-G

where the isomers (called tautomers) are readily interconvertible; the atoms connecting the groups X, Y, Z are typically any of C, H, O or S, and G is a group which migrates during isomerization. The commonest case is when G is H.