The boy, who received 75 per cent burn injuries has been admitted to the Sassoon general hospital here.
A 35-year-old man Ibrahim Shaikh has been arrested in connection the incident, while the other two suspects are absconding, the police said adding a complaint has been registered at Farashkhana police station.
The three suspects, according to police, questioned the boy as to what he was doing and about theft of vehicle batteries when he was loitering in the Kasabapeth area of the city.