Identifying Incorrect Coordination Compound Applications

This question requires us to identify the statement that does not accurately describe a real-world application of coordination compounds. Coordination compounds, featuring a central metal atom bonded to surrounding molecules or ions called ligands, have diverse and important uses in various fields, including medicine and biology.

Analyzing the Options: Coordination Compound Uses

• Option 1: cis-platin effectively inhibits tumour growth.

  cis-platin, which is cis-[PtCl₂(NH₃)₂], is a vital coordination compound used in chemotherapy. It targets and damages the DNA of rapidly dividing cancer cells, thereby slowing or stopping tumour growth. This is a widely recognized and correct application of coordination compounds in medicine.

• Option 2: Chlorophyll helps in photosynthesis.

  Chlorophyll, the essential green pigment found in plants, is a coordination compound containing magnesium (Mg) as the central metal atom, coordinated by porphyrin ligands. Its primary function is to absorb sunlight, providing the energy needed for photosynthesis, the process by which plants convert light energy into chemical energy. This is a fundamental biological and correct application.

• Option 3: Desferrioxime B is used in the treatment of lead poisoning.

  Desferrioxime B (DFO) is known as a powerful chelating agent, particularly effective in treating iron overload conditions (like hemochromatosis) and aluminum toxicity. While chelating agents bind to metal ions, DFO is not the primary or standard treatment for lead poisoning. Treatments for lead poisoning typically involve chelators such as calcium disodium EDTA (CaNa₂EDTA) or dimercaptosuccinic acid (DMSA), which are specifically designed to remove lead from the body. Therefore, this statement describes an incorrect application.

• Option 4: Cyanocobalamine, the antipernicious anemia factor, is a coordination compound of Co.

  Cyanocobalamin, also known as Vitamin B12, is a complex coordination compound featuring cobalt (Co) as its central atom. Vitamin B12 is crucial for red blood cell formation and neurological function, and its deficiency causes pernicious anemia. Thus, its role in treating this condition is a well-established and correct application.

Conclusion on Incorrect Application

After examining each option, it is clear that the statement regarding Desferrioxime B being used for lead poisoning treatment is inaccurate. Its established medical use is primarily for iron overload, not lead poisoning.