The woman, who sustained burn injuries, was admitted to the district hospital, said Deputy SP Arun Kumar.
In her statement to the police, the woman has alleged that her brother-in-law identified as Jahangir, tried to rape her when they were returning to the village on a bike.
Upon resisting, he allegedly threw acid on her and fled from the spot, police said.
A case has been registered against the absconding accused in this connection and efforts are on to nab him.