The second leg is Liverpool's last chance to qualify, but I think it will be very difficult. Real Madrid have already stepped one foot in the next round.
Liverpool qualification is not longer realistic for now, this is football anything can happen but in this case we are talking about a side who has been poor recently, Liverpool is not match fit to get any positive result from Real Madrid.
Agreed with you there is very rare chances of Liverpool especially against Real Madrid. If Real Madrid would get succeed to end the 2nd leg match as draw than it will move to the next round. Liverpool is not in good shape so that there is more high chance of Real Madrid to move to the next round.