Three juveniles were also apprehended in connection with the case.
Police said that the main accused was identified as Vishal (18), a resident of Shakurpur, adding that personal enmity led to the murder of Yusuf who lived in North-West Delhi's Pitampura area.
According to police, Yusuf was murdered allegedly by Vishal and his friends on January 16. Therafter, a case of murder was registered in Subhash Nagar police station.
"During investigation, it was found that Yusuf was returning home along with his friend Pankaj on Janaury 16 and they were allegedly attacked near Delhi Haat, Pitampura, with iron rods by seven boys including Vishal and others.