What type of isomerism is shown by the complex [Co(NH3)5(SCN)]2+?

(a) Linkage isomerism is shown by the complex (b) Cl⁻ is a weak field ligand so it cannot pair up the electron while CN⁻ is a strong field ligand that can pair up the electrons (c) The strong field ligands cause pairing of electrons and in most cases make the last d-orbital empty and thus tetrahedral complex is not formed.