Match List - I with List - II. List-I Chromium (III) Complexes (en = ethylene diamine) List-II Δ 0 ( cm − 1 ) A. [ Cr ( CN ) 6 ] 3 − I. 15,060 B. [ CrF 6 ] 3 − II. 17,400 C. [ Cr ( H 2 O ) 6

Question

Match List - I with List - II.

List-I Chromium (III) Complexes (en = ethylene diamine)	List-II $Δ_{0} (cm^{- 1})$
A. $[Cr (CN)_{6}]^{3 -}$	I. 15,060
B. $[CrF_{6}]^{3 -}$	II. 17,400
C. $[Cr (H_{2} O)_{6}]^{3 +}$	III. 22,300
D. $[Cr (en)_{3}]^{3 +}$	IV. 26,600

Choose the correct answer from the options given below :

TestHub · Accepted Answer

Δ₀ (CFSE) follows the spectrochemical series and chelation: CN⁻ > en > H₂O > F⁻.
Stronger ligand, larger Δ₀:
[Cr(CN)₆]³⁻ → 26,600 (IV),
[Cr(en)₃]³⁺ → 22,300 (III),
[Cr(H₂O)₆]³⁺ → 17,400 (II),
[CrF₆]³⁻ → 15,060 (I).
Hence option (D).

Chemistry - Coordination Chemistry Question with Solution | TestHub

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