Here we have to identify that type of functional group or groups present within the following compound O . If we take a look look for your carbonyl groups, we have a carbonyl group here. We have a carbonyl group here. Now look to see what they're connected to.
Well, the one on the left, that carbonyl is directly connected to an H. Remember we said if a carbonyl is directly connected to an H, that represents an aldehyde functional group. For the other carbonyl, what is it directly connected to? Well, it's connected to a carbon on this side, but that doesn't tell us much.
It's connected to an OH here because it's connected to an OH. That is also another important functional group, that is a carbasilic acid. So this particular compound possesses 2 carbonyl containing functional groups, one being an aldehyde and one being a carbasilic acid.