Q7(b)(ii). Identify A, B and C
Identify A, B and C. What is the relationship between A and B? [Reaction scheme given in the paper: [Co(NH₃)₅Cl]Cl₂ with dilute aqueous NH₃ and NaNO₂ gives A; A on standing or warming with HCl gives B, and B under UV light gives A; [Co(NH₃)₅Cl]Cl₂ in dilute aqueous NH₃ gives C, which with NaNO₂ and concentrated HCl gives B.]
Answer in brief
A = [Co(NH₃)₅(ONO)]Cl₂ (nitrito, red); B = [Co(NH₃)₅(NO₂)]Cl₂ (nitro, yellow); C = [Co(NH₃)₅(H₂O)]Cl₃; A and B are linkage isomers.
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Coverslinkage isomerismnitro and nitrito isomersambidentate ligandpentaamminecobalt(III)aquation
All parts of Question 7
- 7(a) Splitting of d orbitals in a square-planar field10 marks
- 7(b)(i) M–C and C–O bond orders in Ni(CO)₄, [Co(CO)₄]⁻ and [Fe(CO)₄]²⁻10 marks
- 7(b)(ii) Identify A, B and C5 marks
- 7(c)(i) [CoF₆]³⁻ paramagnetic, [Co(CN)₆]³⁻ diamagnetic10 marks
- 7(c)(ii) Structures and magnetic behaviour of Co₂(CO)₈15 marks