Organometallic compound used in the purification of its metals is

• The Mond process was created by Ludwig Mond in 1890. Due to the quick and reversible reaction of carbon monoxide with nickel to form nickel tetracarbonyl, this process is also known as the "carbonyl process." This process is used to extract and purify nickel.
• In this process, nickel oxides are changed into highly pure nickel metal.

The Mond nickel extraction technique involves three stages:
 

• At 200°C, nickel oxide, iron, and cobalt impurities are combined with syngas, a mixture of hydrogen and carbon monoxide gas.
• The impurities will persist as solids in the subsequent reaction, which involves impure nickel and carbon monoxide to produce nickel tetracarbonyl.
  Then the mixture of syngas and nickel carbonyl is heated. This results in the decomposition back to carbon monoxide and nickel.
  Pure Nickel is collected, and carbon monoxide is recycled to continue the process, as this process can be used to extract and purify Nickel.
  Hence, the correct option is option (A)