Rangers might not be the best like they were when were managed by Gerrard but Liverpool also isn't in their form. I would say Rangers might have chance of surprising Liverpool. Also Liverpool are currently having lot of players out with injury so Rangers have a good chance of surprising I would say.
I didn't know Liverpool drew at half-time against Rangers 1-1. Honestly I would be very surprised if Liverpool dropped points again in this match, obviously it wasn't a difficult match but Rangers also have a chance to win.
But even if Liverpool lose, then I don't think they will miss the chance to qualify for the next round considering that Ajax don't have a high chance of chasing Liverpool's points. Liverpool are safe to draw, but I think they will win. Elsewhere, Tottenham seemed safe for 3 points today after ending the first half 3-0. We will see how Klopp can spark his team spirit in the second half, so I think 3-1 is a great ending for Liverpool.