Question

8)
Blue Ferricinium ion is easily oxidized from Ferrocene in presence of
a) Dil HNO3
b) Conc. HNO3
c) Conc. HCI
d) Air
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Answer 1

ANSWER: NITRIC ACID

EXPLANATION:Ferrocene has mp 173o and, although stable to sulfuric acid, it is readily oxidized by nitric acid to the less stable ferricinium ion: ... In cobalticinium ion, the metal has the 18 outer-shell electrons characteristic of krypton. Many other unsaturated organic compounds can form π complexes with transition metals.