A) \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{3-}}\]
B) \[{{\left[ Fe{{\left( CN \right)}_{6}} \right]}^{4-}}\]
C) \[\left[ Fe{{\left( CN \right)}_{5}} \right]\]
D) \[\left[ {{\left( {{C}_{5}}{{H}_{5}} \right)}_{2}}Fe \right]\]
Correct Answer: D
Solution :
Formula of ferrocene is \[\left[ {{\left( {{\operatorname{C}}_{5}}{{H}_{5}} \right)}_{2}} Fe \right]\] Preparation of ferrocene: \[2{{C}_{5}}{{H}_{5}}MgBr+ FeC{{l}_{2}} \to \left[ {{\left( {{\operatorname{C}}_{5}}{{H}_{5}} \right)}_{2}} Fe \right] + 2MgBrCl\] Ferrocene
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