Answer
The correct names are listed below:
a) Phosphorous Pentabromide.
b) Diphosphorous Trioxide.
c) Sulfur Tetrafluroide.
d) Nitrogen Tetrafluroide
Work Step by Step
Since all of the compounds are contently bonded (i.e. covalent compounds), we must name them using the appropriate prefixes. The first element name stays exactly the same and before the second compound, the appropriate prefix is added and the suffix for these compounds is "ide".
a) $PBr_{5}$. Since there are 5 bromine atoms, the prefix before the bromine is "penta". So the name is Phosphorous Pentabromide. Also since this is a covalent molecule the roman numerals are not required which are used to name multivalent elements.
b) $P_{2}O_{3}$. Since there are two phosphorous atoms and three oxygen atoms, the appropriate prefixes are "di" and "tri" respectively. So the name is Diphosphorous Trioxide.
c) $SF_{4}$ Since there are 4 fluorine atoms, the prefix is tetra for fluorine. So the name is Sulfur Tetrafluroide.
d) $NF_{4}$ Since there are 4 fluorine atoms, the prefix is tetra for fluorine. So the name is Nitrogen Tetrafluroide.
