Q7 · CSIR NET Chemistry, June 2011
Paper: CSIR NET June 2011 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Easy
Oxidation occurs very easily in case of
(a)$\mathrm{(\eta^5\text{-}C_5H_5)_2Fe}$
(b)$\mathrm{(\eta^5\text{-}C_5H_5)_2Co}$
(c)$\mathrm{(\eta^5\text{-}C_5H_5)_2Ru}$
(d)$\mathrm{(\eta^5\text{-}C_5H_5)_2Co^+}$
Answer
Answer (as printed): B
Explanation
Compound Number of electron in outer shell of central atom (η5-C5H5)2 Fe 18 (η5-C5H5)2Co 19 (η5-C5H5)2Ru 18 (η5-C5H5)2Co+ 18 Oxidation (loss of electrons) of (η5-C5H5)2, Co to (η5-C5H5)2 Co+ gives an 18 electron compound, (more stable) therefore easy to oxidise.
Explanation as extracted from the printed page; notation may be imperfect.
Study loop for Organometallic Compounds