Animated undead, with a few very rare exceptions, don’t contain the original soul or any of its knowledge. So no they wouldn’t be able to tell you anything, unless you were conversing with something like a lich or a death knight.

As far as I know you also can’t charm a corpse, or a disembodied spirit. You get the answers that you get. So if you’re planning on killing a guy and questioning him afterward, make sure he doesn’t know you’re the one responsible.