Bendtner showed his class with two fine finishes before the penalty
By Chris Whyatt
Nicklas Bendtner's classy hat-trick booked an enticing FA Cup quarter-final at Manchester United as Arsenal swatted aside Leyton Orient.
Marouane Chamakh slotted an early opener before Bendtner's superb header, then a curling finish, put Arsenal's second-string in command.
Bendtner's cool third came from the penalty spot after Kieran Gibbs was tripped by Alex Revell in the box.
Substitute Gael Clichy then lashed in low with 15 minutes remaining.
League One Orient were routinely swept aside in this fifth-round replay, but Arsenal's crushing disappointment from Sunday's failure to collect their first trophy since 2005 - after losing the Carling Cup final to Birmingham - was hard to hide at a muted Emirates Stadium.
The hosts initially looked like they lacked a spring in their step, but fears of further agony evaporated in the seventh minute with a goal of typical Arsenal quality.
Irish debutant Conor Henderson - another ball-playing midfielder - probed for a gap through the back-line and the 19-year-old's deflected pass was pounced on by Tomas Rosicky, who sped to the byeline to clip a square ball through the legs of Charlie Daniels across the box.
Moroccan striker Chamakh held his position to coolly side-foot the ball through the legs of Terrell Forbes from eight yards out, right into the corner of the net, for his first goal since the end of November.
Orient hit back soon after as Ignasi Miquel's poor headed clearance fell for Ben Chorley.
But his full-blooded volley was blocked by a crouching team-mate in front of Manuel Almunia, who nevertheless had it covered.
Their best chance came when pacy Daniels twisted and turned down the left wing to whip in a dangerous low cross.
Yet Revell misjudged his promising position in the area to put his point-blank snapshot wide from only six yards out.
Bendtner had appeared marginally uninterested, but that changed during the course of an sparkling 20-minute spell from the Danish forward before half-time.
Chamakh looked full of confidence after his smart opening goal
His first goal, in the 27th-minute, was a superb effort as he leapt high to outmuscle Daniels before guiding a looping header past the reach of O's keeper Jamie Jones from a floated Gibbs cross.
With that, Arsene Wenger's team took complete control.
The second from Bendtner was even better that the first. Pouncing on a loose ball, he stalked into the area while teasing the ball just in front of Andrew Whing to find a gap before curling a low shot perfectly past Jones into the far corner.
The hosts remained in second gear after the break although Orient, with impressive Daniels a constant outlet down the right, did at least show a sense of adventure.
Abou Diaby should have added Arsenal's fourth in the 50th minute after he danced round a host of defenders on a charge towards goal.
But, after a fine one-two with Chamakh set him free inside the box, he dragged his low shot just wide.
It finally came in the 62nd minute when Gibbs shimmied his way into the area only to be felled by Revell, who looked uncomfortable defending.
Bendtner's penalty finish was true and unerring as he completed his hat-trick before being taken off, though not before nearly gifting a goal to the east Londoners as he dallied while covering at right-back.
One sour note was the withdrawal of Rosicky, who suffered concussion after a heavy collision.
The 75th minute coup de grace was inevitable as injury-hit Arsenal, who host Sunderland in the Premier League before facing Barcelona away in the Champions League, pushed forward in waves.
Emmanuel Eboue's testing ball across the box evaded O's defenders. Chamakh dummied and the ball just eluded substitute Jack Wilshere, but French left-back Clichy ran on to it like a stream train to propel a powerful low finish just inside the far post past overworked Jones.
90:00+4:20 The game is over, as the referee blows his whistle.
90:00+3:51 The official flags Charlie Daniels offside. Emmanuel Eboue takes the free kick.
90:00+3:02 Dean Cox produces a cross.
90:00+2:43 Unfair challenge on Paul-Jose M'Poku by Marouane Chamakh results in a free kick. Free kick taken by Paul-Jose M'Poku.
90:00+1:44 Effort from inside the area by Samir Nasri misses to the right of the target.
90:00+0:41 Corner taken by Dean Cox from the left by-line, Manuel Almunia makes a save.
90:00+0:32 Short corner taken by Dean Cox from the left by-line.
90:00+0:12 Dean Cox takes a shot. Save by Manuel Almunia.
89:24 Foul by Neves Denilson on Paul-Jose M'Poku, free kick awarded. Matthew Spring takes the direct free kick.
87:46 Free kick awarded for an unfair challenge on Andrew Whing by Marouane Chamakh. The free kick is swung in left-footed by Charlie
Daniels, Unfair challenge on Ignasi Miquel by Terrell Forbes results in a free kick. Manuel Almunia takes the free kick.
85:44 Gael Clichy delivers the ball, Terrell Forbes makes a clearance.
83:42 The ball is swung over by Kieran Gibbs, clearance by Terrell Forbes.
Correction - 81:27 Corner taken short by Conor Henderson.
81:27 Corner taken short by Samir Nasri.
79:02 Gael Clichy fouled by Dean Cox, the ref awards a free kick. Free kick taken by Manuel Almunia.
79:02 Booking The referee shows Dean Cox a yellow card for unsporting behaviour.
77:56 Gael Clichy concedes a free kick for a foul on Charlie Daniels. Free kick taken by Dean Cox.
77:56 Substitution Paul-Jose M'Poku replaces Alex Revell.
77:56 Booking Gael Clichy shown a yellow card.
77:04 Short corner taken by Samir Nasri.
74:04 Assist on the goal came from Emmanuel Eboue.
74:04 GOAL - Gael Clichy:Arsenal 5 - 0 Leyton Orient Gael Clichy fires in a goal from inside the box to the bottom right corner of the goal. Arsenal 5-0 Leyton Orient.
73:30 Jonathan Tehoue gives away a free kick for an unfair challenge on Kieran Gibbs. Ignasi Miquel takes the direct free kick.
73:19 Conor Henderson takes a shot. Terrell Forbes gets a block in.
71:24 Samir Nasri decides to take a short corner.
70:54 Andrew Whing sends in a cross, clearance made by Ignasi Miquel.
70:28 Free kick awarded for a foul by Marouane Chamakh on Matthew Spring. Ben Chorley takes the free kick.
69:54 The ball is sent over by Conor Henderson.
Correction - 64:37 The assistant referee signals for offside against Stephen Dawson. Free kick taken by Sebastien Squillaci.
Correction - 64:37 Substitution Jack Wilshere joins the action as a substitute, replacing Nicklas Bendtner.
Correction - 64:37 Substitution Gael Clichy on for Vassiriki Diaby.
Correction - 64:37 Substitution Scott McGleish goes off and Jonathan Tehoue comes on.
Correction - 64:37 Substitution Matthew Spring is brought on as a substitute for Jason Crowe.
64:37 Stephen Dawson is ruled offside. Free kick taken by Sebastien Squillaci.
64:37 Substitution Nicklas Bendtner goes off and Jack Wilshere comes on.
64:37 Substitution Gael Clichy on for Vassiriki Diaby.
64:37 Substitution Jonathan Tehoue joins the action as a substitute, replacing Scott McGleish.
64:37 Substitution Jason Crowe goes off and Matthew Spring comes on.
61:55 Alex Revell concedes a Penalty for a foul on Kieran Gibbs.
61:55 GOAL - Nicklas Bendtner:Arsenal 4 - 0 Leyton Orient Nicklas Bendtner scores a penalty. Arsenal 4-0 Leyton Orient.
61:29 Substitution Samir Nasri replaces Tomas Rosicky.
56:45 Tomas Rosicky delivers the ball, Stephen Dawson manages to make a clearance.
55:27 Unfair challenge on Alex Revell by Kieran Gibbs results in a free kick. Thomas Carroll restarts play with the free kick.
55:04 Pass corner from left by-line taken by Dean Cox to short.
53:12 Scott McGleish produces a header from inside the area that goes over the crossbar.
52:47 Corner from left by-line taken by Dean Cox.
52:41 Centre by Charlie Daniels, Ignasi Miquel makes a clearance.
51:36 Tomas Rosicky takes a shot. Blocked by Jason Crowe.
50:36 Scott McGleish gives away a free kick for an unfair challenge on Sebastien Squillaci. Sebastien Squillaci takes the free kick.
49:43 Vassiriki Diaby produces a right-footed shot from deep inside the six-yard box which goes wide of the left-hand post.
47:27 Neves Denilson takes a shot. Save made by Jamie Jones.
45:37 Marouane Chamakh challenges Stephen Dawson unfairly and gives away a free kick. Ben Chorley takes the free kick.
45:01 The second half kicks off.
45:00+2:29 The whistle is blown to end the first half.
45:00+1:59 Ben Chorley concedes a free kick for a foul on Conor Henderson. Kieran Gibbs takes the free kick.
45:00+1:59 Booking Ben Chorley is shown a yellow card.
44:04 Marouane Chamakh gives away a free kick for an unfair challenge on Ben Chorley. Jamie Jones takes the free kick.
42:40 GOAL - Nicklas Bendtner:Arsenal 3 - 0 Leyton Orient Nicklas Bendtner grabs a goal from just inside the area to the bottom right corner of the goal. Arsenal 3-0 Leyton Orient.
41:17 Free kick awarded for an unfair challenge on Jason Crowe by Neves Denilson. Direct free kick taken by Ben Chorley.
40:41 Nicklas Bendtner concedes a free kick for a foul on Charlie Daniels. Free kick taken by Charlie Daniels.
37:38 Unfair challenge on Nicklas Bendtner by Charlie Daniels results in a free kick. Free kick taken by Conor Henderson.
35:03 Centre by Dean Cox, save made by Manuel Almunia.
33:47 The assistant referee flags for offside against Scott McGleish. Indirect free kick taken by Ignasi Miquel.
32:05 Free kick awarded for a foul by Emmanuel Eboue on Charlie Daniels. Free kick taken by Ben Chorley.
31:05 Free kick awarded for a foul by Vassiriki Diaby on Stephen Dawson. Direct free kick taken by Ben Chorley.
29:33 The assist for the goal came from Kieran Gibbs.
29:33 GOAL - Nicklas Bendtner:Arsenal 2 - 0 Leyton Orient Nicklas Bendtner scores a headed goal from inside the box. Arsenal 2-0 Leyton Orient.
26:49 A cross is delivered by Kieran Gibbs, clearance by Andrew Whing.
24:16 A cross is delivered by Marouane Chamakh.
23:53 Neves Denilson takes a shot. Save made by Jamie Jones.
23:10 Nicklas Bendtner delivers the ball, Alex Revell makes a clearance.
19:42 Inswinging corner taken from the right by-line by Charlie Daniels, save by Manuel Almunia.
18:05 Tomas Rosicky has an effort at goal from outside the box which goes wide right of the goal.
17:20 A cross is delivered by Conor Henderson.
12:22 Charlie Daniels produces a right-footed shot from close in which goes wide of the left-hand upright.
11:47 Emmanuel Eboue concedes a free kick for a foul on Dean Cox. Direct free kick taken by Ben Chorley.
11:15 The ball is swung over by Kieran Gibbs, clearance by Terrell Forbes.
10:06 Corner taken right-footed by Tomas Rosicky to the near post, Alex Revell makes a clearance.
8:50 Effort on goal by Ben Chorley from inside the penalty area goes harmlessly over the bar.
8:10 Charlie Daniels takes a inswinging corner to the near post, clearance by Ignasi Miquel.
6:37 Tomas Rosicky provided the assist for the goal.
6:37 GOAL - Marouane Chamakh:Arsenal 1 - 0 Leyton Orient Marouane Chamakh grabs a goal from inside the box to the bottom left corner of the goal. Arsenal 1-0 Leyton Orient.
5:40 The official flags Alex Revell offside. Sebastien Squillaci takes the free kick.
3:24 The ball is sent over by Kieran Gibbs.
3:05 Vassiriki Diaby takes a shot. Ben Chorley gets a block in.
0:57 Free kick awarded for an unfair challenge on Ignasi Miquel by Scott McGleish. Free kick taken by Sebastien Squillaci.
0:00 The referee gets the match started.
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