Which of the following is a pi-complex? | vedclass

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(B) $\pi$-complex is an organometallic compound where the metal atom is bonded to the $\pi$-electron cloud of an organic ligand. Ferrocene,with the fo

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Ferrocene

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(B) $\pi$-complex is an organometallic compound where the metal atom is bonded to the $\pi$-electron cloud of an organic ligand. Ferrocene,with the formula $Fe(\eta^5-C_5H_5)_2$,is a classic example of a $\pi$-complex where the $Fe^{2+}$ ion is sandwiched between two cyclopentadienyl rings,interacting with their $\pi$-electron systems. Trimethyl aluminium and diethyl zinc are primarily $\sigma$-bonded organometallic compounds. Nickel carbonyl,$Ni(CO)_4$,is a metal carbonyl complex where bonding involves both $\sigma$-donation and $\pi$-backbonding,but ferrocene is the prototypical example of a $\pi$-complex involving aromatic rings.

Which of the following is a $\pi$-complex?

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