Which of the following coordination complexes exhibits linkage isomerism?

Step-by-step solution

Linkage isomerism arises in a coordination compound containing an ambidentate ligand. An ambidentate ligand has two different donor atoms and can bind to the central metal ion through either of them. In [ Co ( NH ₃)₅( NO ₂)] Cl ₂ , the NO ₂⁻ ligand is ambidentate. It can bind through the nitrogen atom (forming a nitrito-N complex) or through an oxygen atom (forming a nitrito-O complex), thus exhibiting linkage isomerism. [ Co ( NH ₃)₅( SO ₄)] Br contains no ambidentate ligand and instead exhibits ionization isomeri