Molecular structure of pyridinium chlorochromate. It is a salt of the pyridinium cation and chlorochromate anion.
Pyridinium chlorochromate oxidizes a secondary alcohol (such as 2-propanol) to a ketone (in this case acetone).
Pyridinium chlorochromate oxidizes a primary alcohol to an aldehyde. Unlike Jones reagent (which is aqueous and strongly acidic), PCC (which is anhydrous) does not further oxidize the aldehyde to a carboxylic acid.