It is observed that when ¹⁸O-labeled water dissolves a ketone, the oxygen in it is incorporated into the ketone. Propose the plausible mechanism for the reaction.

Give the product obtained when cyclopentanone reacts with NaC≡CCH₃ followed by treatment of dilute H₃O⁺. Ignore stereochemistry.

Which of the following correctly describes the partial charges in a carbonyl group and why the carbonyl carbon is electrophilic?

Draw the major product of the reaction given below.

Sort the following compounds in descending order of nucleophilic addition reactivity: