Lucas Perez’s hat-trick put the Gunners out of sight against Basel before Iwobi wrapped up a 4-1 victory in Switzerland.
That could hand Arsene Wenger’s side a favourable draw in the last 16, and guarantees a second leg on their own patch.
“It’s been a good night,” Iwobi told the club’s website. “I wouldn’t say my goal was a cracker but it was a great assist by Mesut.
“It’s felt like a long time coming and it’s always a great feeling to score a goal, but I’m just pleased with the team¹s performance and that we were able to finish top of the group.
“Having a second leg at home is a big advantage [in the knockout stage] and it gives you the belief that you can do it. However, the Champions League is full of top teams.”