Vishnu Narain Shivpuri, a resident of paper mill colony, threw acid on the 24-year-old victim, a native of Dehradun, yesterday in Mahanagar area after she refused his marriage proposal, they said.
The victim did not sustain any injury in the incident as she had moved aside to protect herself, police said.
She told the police that Shivpuri was friend of her late father and was pressurising her for marriage.