The correct answer is b) dinitrogen tetroxide.
To break this down, we first look at the chemical formula, which is N2O4. The formula indicates that there are two nitrogen (N) atoms and four oxygen (O) atoms present in the compound.
In naming binary molecular compounds (which are composed of two different elements), we use prefixes to indicate the number of each type of atom. The prefix for two is ‘di-‘, and the prefix for four is ‘tetra-‘. Hence, for the two nitrogen atoms, we use ‘dinitrogen,’ and for the four oxygen atoms, we use ‘tetroxide.’
Putting these together, the proper name for N2O4 is indeed dinitrogen tetroxide. The other options listed do not accurately reflect the number of atoms present in the compound: option a) nitrogen tetroxide does not specify the number of nitrogen atoms, option c) dinitrogen oxide does not specify the number of oxygen atoms, and option d) nitrogen trioxide suggests there are three oxygen atoms, which is incorrect.