Including cis-trans stereoisomers, how many enol tautomers are possible for the following ketone?
A) 1
B) 2
C) 3
D) 4

Question

Including cis-trans stereoisomers, how many enol tautomers are possible for the following ketone? 
A) 1 
B) 2 
C) 3 
D) 4

Quizplus · Accepted Answer

There are four possible enol forms for the given ketone. However, two of these forms are identical due to the presence of a plane of symmetry. Thus, there are only three unique enol tautomers. Additionally, there are no cis-trans isomers since there is no double bond in the ketone. Therefore, the total number of enol tautomers including cis-trans isomers is 3.

Including Cis-Trans Stereoisomers, How Many Enol Tautomers Are Possible for the Following