Match List - I with List - II. List - I Chromium (III) Complexes (en = ethylene diamine) List - II _0 (cm^ -1 ) A. [Cr(CN)_6]^ 3- I. 15,060 B. [CrF_6]^ 3- II. 17,400 C. [Cr(H_2O)_6]^ 3+ III. 22,300 D. [Cr(en)_3]^ 3+ IV. 26,600 Choose the correct answer from the options given below :
D. A-IV, B-I, C-II, D-III
The crystal field splitting energy _0 depends on the strength of the ligand. According to the spectrochemical series, the order of ligand strength is F^- Thus, the order of _0 for the given complexes is [CrF_6]^ 3- Matching with the given values: [CrF_6]^ 3- has the minimum _0 = 15,060 cm^ -1 (B I). [Cr(H_2O)_6]^ 3+ has _0 = 17,400 cm^ -1 (C II). [Cr(en)_3]^ 3+ has _0 = 22,300 cm^ -1 (D III). [Cr(CN)_6]^ 3- has the maximum _0 = 26,600 cm^ -1 (A IV). This corresponds to A-IV, B-I, C-II, D-III. Answer: A-IV, B-I, C-II, D-III
Related: Chemistry — Coordination Compounds · All PYQ Banks