No, the parent chalcone system lacks an unsaturated carbon directly conjugated to the ketone. However it may be observed in an appropriately substituted system.
NO, due to lack of alpha sp3 electron donor carbon, but it may possible if beta unsaturated carbon substituted aromatic ring has electron donor such as OH, NRR.
Chalcones are alpha-beta unsaturated ketones.Chalcone can not show keto enol tautomerism because it needs active methylene group adjucent to keto group so that H can shift to oxygen atom of C=O group.