Q42 · CSIR-NET Chemistry, December 2016
Paper: CSIR-NET December 2016 · Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Bioinorganic Chemistry – General · Marks: 2 · Difficulty: Easy
Match the species in column X with their properties in column Y | Column-X | Column-Y |
|---|
| (1) Heme A | (i) oxo-bridged, $\mathrm{Mn_{4}}$ cluster |
| (2) Water splitting enzyme | (ii) tetragonal elongation |
| (3) $[\mathrm{Mn(H_2O)_6}]^{2+}$ | (iii) Predominantly, $\pi \rightarrow \pi^{*}$, electronic transitions |
| (4) $[\mathrm{Cr(H_2O)_6}]^{2+}$ | (iv) $\mathrm{d} \rightarrow \mathrm{d}$ spin-forbidden transitions |
(a)(1)-(iii), (2)-(i), (3)-(v), (4)-(ii)
(b)(1)-(iii), (2)-(i), (3)-(iv), (4)-(ii)
(c)(1)-(v), (2)-(iii), (3)-(iv), (4)-(ii)
(d)(1)-(iii), (2)-(i), (3)-(iv), (4)-(v)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Heme: π→π* bands. The water-splitting OEC: an oxo-bridged Mn₄Ca cluster. [Mn(H₂O)₆]²⁺ (d⁵ high spin): only spin-forbidden d–d bands. [Cr(H₂O)₆]²⁺ (d⁴): Jahn–Teller tetragonal elongation (b).
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