Ziegler catalyst → Titanium
Ziegler- Natta catalyst contains two parts – a transition metal compound and an organoaluminum compound. Organoaluminum compounds contain bonds between aluminum and carbon atoms. Examples of Ziegler-Natta catalysts include TiCl4+Et3Al and TiCl3+AlEt2Cl. So, if we want to write the chemical formula of one of the Ziegler-Natta catalysts then it can be represented as TiCl4Al(CH3)2(CH2)2Cl.
Blood pigment →Iron
Haemoglobin: RBCs/erythrocytes play an important role in the transport of oxygen to various tissues. It is mainly due to the presence of an iron-containing, red-colored pigment called haemoglobin. The presence of haemoglobin gives RBCs the red colour.
Wilkinson catalyst→Rhodium
Wilkinson's catalyst is usually obtained by treating rhodium(III) chloride hydrate with an excess of triphenylphosphine in refluxing ethanol. Triphenylphosphine serves as both a ligand and a two-electron reducing agent that oxidises itself from oxidation state (III) to(V).
Vitamin B12 →Cobalt
Cobalt is a major part of the structure of vitamin B12. Therefore, if you get enough vitamin B12, you will also get enough cobalt. Adults need about 0.0015mg (1.5 micrograms) of vitamin B12 a day.