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Pi - Complex - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

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  • 2 Questions around this concept.

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Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R”

Assertion A: In the complex \mathrm{Ni\left ( CO \right )_{4}} and \mathrm{Fe\left (CO \right )_{5}}, the metals have zero oxidation state.

Reason R: Low oxidation states are found when a complex has ligands capable of \mathrm{\pi } –donor character in addition to the \mathrm{\sigma }– bonding.

In the light of the above statement, choose the most appropriate answer from the options given below

Concepts Covered - 1

Pi - Complex

These are the compounds of metals with alkenes, alkynes, benzene and other ring compounds. In these complexes, the metal and ligand form a bond that involves the \pi electrons of the ligand. Three common examples are Zeise's salt, ferrocene and dibenzene chromium. These are shown in the figure below:


                Zeise' salt                                       Ferrocene                 Dibenzene chromium

The number of carbon atoms bound to the metal in these compounds is indicated by the Greek letter 'η' with a number. The prefixes η2, η5 and η6 indicate 2, 5 and 6 carbon atoms are involved in the formation of the bond with the metal atom/ion in the compound.

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Pi - Complex

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