(a) It exhibits linkage isomerism . For details, consult section 6 .
(b) For answer, consult sectiuon 10 .
(c) In tetrahedral complexes , unpaired electrons exits as odd electrons since electrons pairing is distablised. Infact, they have weak splittting since none of the ligands lie within the plane of the orbitals. as a result , tetrahedral complexes generally exist as high spin complexes .