Should one list the journals of submitted papers on a CV?
Opinions differ on this issue.  The advantage of listing where you have submitted the paper is that it gives a clue as to how good you think the paper is.  If you submit to the Annals of Mathematics, then you are suggesting it's a wonderful paper.  If you submit to Advances in Pure Mathematics (not to be confused with the reputable journal Advances in Mathematics), then you might as well have generated your paper using random text.  Listing this information gives you a tactful way to indicate what you consider to be your best work even before it is published, and this may be helpful to someone who wants to take a look at your papers but has only a little time.

On the other hand, submission is not nearly as meaningful as acceptance, because you are a biased judge of your own work.  Furthermore, you could deliberately submit to an unrealistically prestigious journal just for the purpose of writing "submitted to the Annals".

Listing the journals can also come across as presumptuous, like you believe the papers will obviously be accepted and you are already bragging about the presumed outcome.

I'd recommend against it.  I think the benefits are small, and it's not worth the risk of looking arrogant or manipulative.  On the other hand, it's something people sometimes do, and it doesn't seem to do them much (if any) harm, so if you like the idea I don't think it would be a big mistake.