Multiple choice Which of the following complexes, largest crystal field splitting occurs in [Co(en)3]3+ [Co(H2O)6]3+ [Co(CN)6]3- [Co(NH3)6]3+ [CoCl6]3- Reveal answer Fill a bubble to check yourself C Correct answer Explanation This option is correct because CN- is one of the strongest field ligands. Crystal field splitting will be highest in [Co(CN)6]3-.