= Solution
\b[<cyclohexylamine> is expected highest in the <spectrochemical series> for comparable <metal> environments.] Its alkyl substituent increases the electron-donating ability of <nitrogen> relative to <ammonia>, strengthening the sigma interaction and raising the <metal>–ligand sigma-antibonding levels. The anionic pi donors tend to raise occupied <metal> $d_\pi$ levels and give smaller splittings. Steric effects and the <metal> can modify the exact ordering, so the comparison is a <ligand field> trend rather than a universal basicity-to-splitting identity.
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