Police said Muthusamy (47) threw acid on Ravisankar and Laxmansamy this afternoon over some personal dispute.
Some acid also fell on two girl students. Both the victims were admitted to different private hospitals while the two girls were treated as outpatients, police said.
M Aruchamy, Director and Administrator of the Kongunadu Arts and Science College, filed a complaint against Muthusamy, based on which a case has been registered, they said.
Depressed over the incident, Muthusamy consumed cyanide, police said, adding, he has been admitted to hospital, where his condition is said to be stable.