oxidation of glycerol

[bridgetmaude]

I was wondering if anyone knows what happens to glycerol when it is oxidised with KMnO4? do all 3 OH groups become carboxyl groups?
Thanks so much if you can help me out 

[lzxnl]

I was wondering if anyone knows what happens to glycerol when it is oxidised with KMnO4? do all 3 OH groups become carboxyl groups?
Thanks so much if you can help me out 

Let me just ask you this. Can you imagine the C2 alcohol group ever being replaced by a carboxylic acid group? It's not possible because that carbon is bonded to two other carbons yet a COOH group requires three bonds to non-carbon atoms. The C2 doesn't have enough spare bonds for that.
Instead, you're going to oxidise the C1 and C3 alcohols to carboxylic acids and the C2 alcohol will become a ketone.