Answer: The formula for tetracarbon difluorine octabromide is 

Step-by-step explanation:
 The naming of covalent compound is given by: 
 The less electronegative element is written first. 
 The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'. 
 If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on. 
 Hence, the correct formula for tetracarbon difluorine octabromide is 
