JEE AdvancedHardQuestion 740013
Question
Which pair shows linkage isomerism?
- A[Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅(ONO)]²⁺Correct
- B[Co(NH₃)₆]³⁺ and [Co(NH₃)₅Cl]²⁺
- C[Pt(NH₃)₂Cl₂] cis and trans
- D[Fe(CN)₆]³⁻ and [Fe(CN)₆]⁴⁻
Correct answer
[Co(NH₃)₅(NO₂)]²⁺ and [Co(NH₃)₅(ONO)]²⁺
Explanation
Linkage isomerism occurs with ambidentate ligands (can bind through two different atoms). NO₂⁻ can bind through N (nitro) or O (nitrito). [Co(NH₃)₅(NO₂)]²⁺ = nitro; [Co(NH₃)₅(ONO)]²⁺ = nitrito isomer.