it is abbreviated as$ PCC$ and is called Collin's reagent. This reagent is used in non aqueous solvent like $C{H_2}C{l_2}$
It is a very good reagent because it checks the further oxidation of aldehyde to carboxylic acid while rest oxidising agent oxidise aldehyde into carboxylic acid.




$C{H_2} = C{H_2}\xrightarrow{{{O_2}/Ag}}X\xrightarrow{{473\,{\kern 1pt} K}}Y$