However, Martin Odegaard put Arsenal ahead, converting a penalty in the 53rd minute after Sam Johnstone brought Eddie Nketiah down in the box.
Nketiah opened scoring for the Gunners courtesy of an assist from Gabriel Martinelli 26 minutes into the game.
Sunday’s win positions Arsenal as a serious contender for this season’s title, having gained 50 points in 19 games.
With 40 points in 15 games, Arsenal are now seven points ahead of Newcastle, who earlier on Monday beat Leicester City.
The Gunners have now won nine out of their 10 games across all competitions.
Arsenal got their Europa League campaign off to a positive start with a 2-1 win over FC Zurich on Thursday evening.
Arsenal moved back ahead of Tottenham in the race for UEFA Champions League qualification with a hard-fought 2-1 win at West Ham on Sunday.
On Tuesday, Arsenal moved into the 2021/2022 League Cup quarter-finals with a victory over fellow English Premier League (EPL) side Leeds United.
