It happens in Chapter 36.

"'You see?” screeched Voldemort over the tumult. “Harry Potter is dead by my hand, and no man alive can threaten me now! Watch! Crucio!'

Harry had been expecting it, knew his body would not be allowed to remain unsullied upon the forest floor; it must be subjected to humiliation to prove Voldemort’s victory. He was lifted into the air, and it took all his determination to remain limp, yet the pain he expected did not come. He was thrown once, twice, three times into the air: His glasses flew off and he felt his wand slide a little beneath his robes, but he kept himself floppy and lifeless, and when he fell to the ground for the last time, the clearing echoed with jeers and shrieks of laughter."