00:06
This question asks us which of these pairs of structures are keto enol tautomers.
00:13
So the first thing to recognize here is what an enol looks like.
00:18
So an enol has a double bond with an alcohol on the double bond.
00:24
So the alcohol has to be on the double bond in order for it to be an enol.
00:28
And then in order to make sure that the ketone and the enol are totemers of each other, the oh -h from the enol has to be on the.
00:36
The same carbon that the ketone is on.
00:39
So starting with a, if we look at this first structure, this is not an enol because the oh is not directly attached to the double bond.
00:47
So this cannot be a keto enol tautomer pair.
00:51
In part b, again, this is not an enol because we don't have that double bond.
00:55
So this can't be either.
00:57
In part c, we do have an enol, so that's good...