1) As bound ligands, which of the following causes the largest splitting of d-orbitals?

Question

a. phen
b. H2O
c. I–
d. CN–
e. C2O4^2–

Answer D

2) The spectrochemical series
a. lists ligands in order from monodentate to hexadentate.
b. lists ligands in the order of their electronegativity.
c. lists coordination compounds in order of their color.
d. lists complex ions in order of their color.
e. lists ligands in order of their tendency to split d orbitals.

Answer E

Answer 1

1 is right.
2. I am not familiar with this particular series but you can read about it here.
http://en.wikipedia.org/wiki/Spectrochemical_series