I realize that you have all turned your labs in by now, but here is a word about this question. First, have a look at what you find about keto-enol tautomerism by looking in the index of the lecture text. Then, consider the dehydration of 1,2-cyclohexanediol in such a way that the double bond forms between the carbons where both hydroxyl groups originally were. After the dehydration to lose one hydroxyl group and a hydrogen to form the alkene, the remaining structural group is called an enol. It is an alkene-alcohol, hence the name enol.
Enols isomerize to carbonyl groups in the way described in the text.
I hope that helps to finish the puzzle.