Hoolohan met Seamus Coleman’s flighted ball with a controlled first-time strike three minutes into the second half at the Stade de France to give Ireland a lead they fully deserved.
However, having been kept quiet for long spells by the Irish defence, Sweden captain Zlatan Ibrahimovic created the equaliser in the 71st minute when his cutback was turned into his own net by Aston Villa defender Clark.
It is a result that keeps both sides in the running in Group E, which also contains Italy and much-fancied Belgium, but the Irish will be especially frustrated at leaving with only a point.
Then Clark headed on a left-wing corner and veteran captain John O’Shea, stretching at the far post, was just unable to turn the ball in with the goalkeeper beaten.
Robbie Brady, an attacking player at club level but deployed as a left-back for Ireland, crashed a rising right-foot shot inches over, and in the 32nd minute Hendrick played a one-two with Shane Long before curling an effort from 25 yards onto the bar.
Meanwhile, former Paris Saint-Germain star Ibrahimovic was unable to trouble Irish goalkeeper Darren Randolph from a long-range free-kick.
Sweden were dealt a blow right on half-time when right-back Mikael Lustig came off with what appeared to be a groin injury.
Coach Erik Hamren was forced into a defensive reshuffle as substitute Erik Johansson came on in central defence and Victor Lindeloef moved out to the right.
That defence was finally breached three minutes into the second period. Coleman did superbly on the right and lifted the ball towards the far post where Hoolahan, all alone, smashed home a delightful first-time shot beyond Isaksson.
The sea of Irish fans behind the goal, bedecked in green, erupted, but having created almost nothing themselves, Sweden were nearly level barely a minute later.
Clark turned a corner towards his own goal but Randolph made a superb save, diving low to his right to scoop the ball away.
Ibrahimovic finally came to life on the hour, firing just wide with his back to goal following a Martin Olsson centre. He had a new partner in attack by that point, with having replaced Marcus Berg in a switch which proved pivotal as Sweden dug out the equaliser.
Guidetti’s flick released Ibrahimovic, and his ball from the left was headed past Randolph by the unfortunate Clark.
Ibrahimovic then came within a whisker of converting a low driven cross by Olsson, but a point was the very least Ireland deserved as the match ended all square.
1 / 8
2 / 8
3 / 8
4 / 8
5 / 8
6 / 8
7 / 8
8 / 8
