Question

which has the correct name-formula combination?
answer:
a chlorine pentafluoride - clf
b diphosphorus pentoxide - $p_2o$
c carbon tetraiodide - $ci_4$
d sulfur tetrafluoride - sf

Explanation:

• Option A: "Chlorine pentafluoride" requires 5 fluorine atoms, so the formula should be $\text{ClF}_5$, not $\text{ClF}$.
• Option B: "Diphosphorus pentoxide" means 2 phosphorus and 5 oxygen atoms, so the formula should be $\text{P}_2\text{O}_5$, not $\text{P}_2\text{O}$.
• Option C: "Carbon tetraiodide" means 1 carbon and 4 iodine atoms, so the formula should be $\text{CI}_4$, which matches.
• Option D: "Sulfur tetrafluoride" requires 4 fluorine atoms, so the formula should be $\text{SF}_4$, not $\text{SF}$.

Answer:

C. carbon tetraiodide - $\text{CI}_4$