are these gloves touchscreen compatible?

It depends on tightness and thickness. These 4mil gloves are absolutely touchscreen compatible if your glove fits perfectly. If it’s too loose, it won’t be because the glove itself will slide. I have these 4mil gloves and another 10mil gloves (which is almost as thick as kitchen rubber gloves) and both are touch screen compatible, although the 10mil is sometimes harder to register the touch due to its thickness.

Will these protect hands against alcohol? are the white ones the same as black for protection?

Pretty sure they'll hold up with alcohol exposure! They have withstood gasoline, oil, bleach, paint thinner and Acetone...sometimes all of the above with the same pair! Like these way better than the white or blue ones! IMHO the black Nitrile gloves are less prone to ripping and I can get multiple uses out of a pair by just rolling them off inside-out and allowing them to dry out!