# Is there any condition where alcohol oxidizes in presence of chromium trioxide to give carboxylic acid [duplicate]

My text book says that alcohol in presence of $$\ce{CrO3}$$ will only give aldehyde. But I then saw this question in which $$\ce{CrO3}$$ oxidizes alcohol directly to carboxylic acid.

I need to know in which conditions it will give aldehyde and in which conditions it will give carboxylic acid.

• Jun 21 at 11:48

Generally you need anhydrous conditions to get the aldehyde because aldehydes that can form hydrates are further oxidised to the acid. Anhydrous conditions with a complexing agent such as pyridine to aid solubility (e.g. Collins reagent 1) will give good yields of aldehydes.

Aq. acid conditions (known as Jones reagent) 2 give the carboxylic acid

See this answer How does PCC not oxidize aldehyde?

The use of Chromium reagents has greatly diminished due to their toxicity and waste disposal problems.