Orient were the last League One side left in the competition and they did not disgrace themselves despite the heavy defeat. The visitor’s had pledged to attack but in taking on the Gunners at their own passing game there was only going to be one winner.
Arsenal raced into a three goal lead by the break with Bendtner completing his hat-trick in the second half.
Nicklas Bendtner got his first on the half-hour, heading home a Kieran Gibbs cross, then the game was effectively over as a spectacle with a third just before the break.
Bendtner took advantage of some sloppy Orient defending to curl home a delightful shot and leave the visitor’s looking demoralised.
The Danish international earned himself the match ball when he converted from the penalty spot after Gibbs had been felled.
With the Gunners playing well within themselves and Orient looking shattered a fifth goal arrived 15 minutes from time courtesy of Gael Clichy and comprehensively ended the visitor’s 13 game unbeaten run in cup and league games.
Referee: Lee Mason
Venue: Emirates Stadium
Arsenal scorers: Chamakh 7, Bendtner 30, 43, 62 (pen), Clichy 75
02 Diaby (Clichy 66 (yellow card)
07 Rosicky (Nasri 62)
52 Bendtner (Wilshere 66)
04 Chorley (yellow card)
17 Crowe (Spring 65)
07 Cox (yellow card)
09 McGleish (Tehoue 65)
11 Revell (M'Poku 79)