Which of the following complex ions has the largest d-orbital splitting energy? (ox = oxalate C2O4 2-)?

Question

Choices: 1.) [Co(NH3)6]3+ 2.) [Co(CN)6]3- 3.) [Co(ox)3]3- 4.) [CoCl6]3- 5.) [Co(OH2)6]3+

Answer 1

2