Match the complexes given in List-I with their properties given in List-II

Choose the correct answer from the options given below:

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

The correct answer is Option (3) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

Determine oxidation states

(A) [FeF₆]³⁻

Fe + 6(–1) = –3
Fe – 6 = –3 → Fe³⁺ (d⁵)
F⁻ = weak ligand → high-spin
→ d⁵, high spin → (II)

(B) [CoF₆]³⁻

Co + 6(–1) = –3
Co – 6 = –3 → Co³⁺ (d⁶)
F⁻ = weak ligand → high-spin
→ d⁶, high spin → (I)

(C) [Mn(CN)₆]³⁻

Mn + 6(–1) = –3
Mn – 6 = –3 → Mn³⁺ (d⁴)
CN⁻ = strong ligand → low-spin
→ d⁴, low spin → (IV)

(D) [Co(CN)₆]³⁻

Co + 6(–1) = –3
Co – 6 = –3 → Co³⁺ (d⁶)
CN⁻ = strong ligand → low-spin
→ d⁶, low spin → (III)