Arti Dikshit, a resident of Yamuna Vihar, attacked Vineet Kumar, 25, at Cross River Mall in Anand Vihar. She feared that he was about to desert her, police said.
"We received a call and rushed Vineet to hospital. He suffered 45 per cent burn injuries," Additional Deputy Commissioner of Police Asif Mohammad Ali told IANS.
Police found Arti in Surajmal Vihar, near the mall. "We have detained her and informed her parents," said Ali.
Arti called Vineet, a resident of Maujpur, to the mall on the pretext of watching a movie. After spending two hours, they entered into an alteration over the issue of marriage, police said.
During the argument, she took out an acid bottle from her purse and threw acid on Vineet's face.