This reaction involves an oxidation or Reduction?

This reaction involves an oxidation or NaCNBH,, HO reduction? (circle one) pH 4-5 HO, cat. HCI HO, HO OH Daniel Romo Reaction Mechanisms Basic (single-step) Mechanism Types (accounting for -80% of O-Chem is below!) 1) For the following transformations involving one elementary step each: i) Draw &+ and &- on the atoms that are most electron deficient or electron rich on the starting material which will help you to draw the mechanism provide mechanism arrows to describe electron flow for these transformations i) i) Extra credit: name the elementary steps on blanks provided :CI: N CEN