Which of the structures shown is the enol tautomer of the ketone drawn?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: D

The ketone is acetone. Its enol, prop-1-en-2-ol, has the OH on a C=C carbon and the formula C3H6O. The other structures (propanal, allyl alcohol, methyloxirane) are isomers of C3H6O but not tautomers of acetone.

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