Question Bank › Inorganic Chemistry › Organometallic Compounds › ABC26IN1344Oxidation occurs very easily in case of · ABC26IN1344 Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET JUNE 2011 · Marks: 2 · Difficulty: Easy
Oxidation occurs very easily in case of
(a) $\left(\eta^{5}-\mathrm{C}_{5} \mathrm{H}_{5}\right)_{2} \mathrm{Fe}$
(b) $\left(\eta^{5}-\mathrm{C}_{5}\mathrm{H}_{5}\right)_{2}\mathrm{Co}$
(c) $\left(\eta^{5}-\mathrm{C}_{5}\mathrm{H}_{5}\right)_{2}\mathrm{Ru}$
(d) $\left(\eta^{5}-\mathrm{C}_{5}\mathrm{H}_{5}\right)_{2}\mathrm{Co}^{+}$
Answer Answer: B ✓ checked by 4AB · confidence high
Explanation Cobaltocene is a 19-electron complex; losing one electron gives the 18-electron cobaltocenium ion, so it is oxidised extremely easily (E° ≈ −1.3 V). Ferrocene and ruthenocene are 18-electron and much harder to oxidise.
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