Really? 

I get that formaldehyde and acetaldehyde are common names, but propionaldehyde? That's pushing it. Is it really used in chemistry more than propanal? I don't know about most people, but I couldn't be bothered to type all that in when I could just type in "propanal". I don't think it needs to be changed, but there should be some sort explanation for why propionaldehyde is used instead.