These molecules have non super imposable mirror images

These molecules posses a center of symmetry

These molecules possess a plane of symmetry and hence, are achiral

These molecules possess C_n axis of symmetry

In K₃[Fe(CN)₆], the ligand has satisfied both primary and secondary valencies of ferric ion

In K₃[Fe(CN)₆], the ligand has satisfied only the secondary valency of ferric ion

In K₄[Fe(CN)₆], the ligand has satisfied both primary and secondary valencies of ferrous ion

In [Cu(NH₃)₄]SO₄, the ligand has satisfied only the secondary valency of copper

3

4

5

6

Ionization

Optical

Polymerisation

Linkage

Chlorophyll is a green pigment in plants and contains calcium

Haemoglobin is a red pigment of blood and contains iron

Cyanocobalamin is vitamin B₁₂ and contains cobalt

Carboxypeptidase−A is an enzyme and contains zinc