3-hydroxybutanal formed when X reacts whith Y in dilute Z solution. What are X, Y, and Z?

3 - hydroxybutanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are X,Y, and Z? X Y Z

3-Hydroxy butanal is formed when (X) reacts with (Y) in dilute (Z) solution. What are(X),(Y) and(Z)?

The compound X reacts with ozone in aqueous medium to form Y. Ozone reacts with Y to form . If Z is an oxidising agent, then X, Y and Z are respectively -