For each of the following pairs of complexes, identify the one that has the larger LFSE:

(a) [Cr(OH₂)₆]₂⁺ or [Mn(OH₂)₆]₂⁺
(b) [Fe(OH₂)₆]₂⁺ or [Fe(OH₂)₆]₃⁺
(c) [Fe(OH₂)₆]₃⁺ or [Fe(CN)₆]₃⁻
(d) [Fe(CN)₆]₃⁻ or [Ru(CN)₆]₃⁻
(e) tetrahedral [FeCl₄]₂⁻ or tetrahedral [CoCl₄]₂⁻