Carbon tetrachloride
The covalent name of C2H6 is ethane.
The covalent bond name for B2Si would be hepta. This is known to be the short term for it.
Sulfur trioxide
CH4 is Methane. The first(smallest) alkane, which is a functional group of hydrocarbons.
The name of the covalent compound CH4 is methane.
The covalent compound name for SeF2 is selenium difluoride.
The name for the covalent compound IF7 is iodine heptafluoride.
The covalent compound name for SCl2 is sulfur dichloride.
Fe3N2 is ferric nitride, and it is ionic, not covalent.
The name of the covalent compound SeF is selenium (IV) fluoride.
The name of the covalent compound SbBr7 is antimony heptabromide.
The name of the covalent compound Np3O8 is neptunium octaoxide.