${\rm{Fe}}{\left( {{{\rm{\eta }}^5} - {{\rm{C}}_5}{{\rm{H}}_5}} \right)_2}$

${\rm{Fe}}{\left( {{{\rm{\eta }}^2} - {{\rm{C}}_5}{{\rm{H}}_5}} \right)_2}$

${\rm{Cr}}{\left( {{\eta ^5} - {{\rm{C}}_5}{{\rm{H}}_5}} \right)_5}$

${\rm{Os}}{\left( {{{\rm{\eta }}^5} - {{\rm{C}}_5}{{\rm{H}}_5}} \right)_2}$

NEET UG CHEMISTRY MCQ: CO-ORDINATION COMPOUNDS

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Ferrocene is:

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Correct option: A

\mathrm{Fe}{\left( {{\mathrm{\eta }^5} - {\mathrm{C}_5}{\mathrm{H}_5}} \right)_2}

Option A (

\mathrm{Fe}{\left( {{\mathrm{\eta }^5} - {\mathrm{C}_5}{\mathrm{H}_5}} \right)_2}

) is correct because it accurately represents ferrocene, where iron is coordinated to two cyclopentadienyl rings in a pentahapto (η5) fashion.

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