Reliance Industries (RIL) has appointed former Indian Oil Corporation (IOC) Chairman Sanjiv Singh as Group President and Member of the oil-to-chemicals (O2C) business leadership team. He will be leading the group's manufacturing services, RIL Executive Director Hital R Meswani said. Singh, who was the Chairman of IOC for three years, superannuated from his services at the company on June 30.