Answer
The correct names are listed below for the compounds:
a) Nitrogen Trichloride.
b) Carbon Tetraiodide.
c) Carbon Monoxide.
d) Sulfur Tetrachloride
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) $NCl_{3}$. Since there are 3 chlorine atoms, the prefix before the chlorine is "tir". So the name is Nitrogen Trichloride. Also the prefix "mono" is not used for the first element.
b) $CI_{4}$. Since there are 4 iodine atoms and only one carbon atom, the appropriate prefix for the iodine atoms is "tetra" So the name is Carbon Tetraiodide.
c) $CO$ Since there is one carbon atom and one oxygen atom the prefix is "mono" for the oxygen atom. So the name is Carbon Monoxide.
d) $SCl_{4}$ Since there are 4 chlorine atoms, the prefix is tetra for chlorine. So the name is Sulfur Tetrachloride.