What brands of mouthwash contain alcohol and in what percentages ?

All of them unless they specifically say they don't on the label. If you want to know how much for each brand you have to do your own homework there... as they vary.

What brands of mouthwash contain alcohol and in what percentages ?

Following is a link to Household Products Database operated by National Institutes of Health (NIH). You can search mouthwash and the ingredients of each will be listed including ethanol content. This will get you to appropriate section:

HPD - mouthwash (http://www.householdproducts.nlm.nih.gov/cgi-bin/household/prodtree?prodcat=Personal+Care&purpose=Oral+Hygiene&type=mouthwash)

In addition you can check the label of any mouthwash you are purchasing as any product containing in excess of 0.5% alcohol must be specifically listed on the label (US-FDA).