Which of the following statements is correct pertaining to the isomers of curcumin, the bright yellow plant extract that Marco Polo wrote about in 1280 AD? a. one of the tautomers (the ketone) is lethal if ingested
b. one of the tautomers ) the nol) has anti-oxidant properties
c. neither one of the tautomers have anti-oxidant properties
d. both the keto and enol tautomers have anti-oxidant properties

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

A. is your answer.  hope this  

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar systemb.safir7.which technology limit the future of space exploration b. scientist must first develop certain technologies before missions can be completed.

The answer is c. risk