Coordination Compounds 2 Question 13
####14. $Mn _2(CO) _{10}$ is an organometallic compound due to the presence of
(2019 Main, 12 Jan I)
(a) Mn - Cbond
(b) $Mn-O$ bond
(c) $C-O$ bond
(d) $Mn-Mn$
15 The number of bridging $CO$ ligand(s) and $Co-Co$ bond(s) in $Co _2(CO) _8$, respectively are
(2019 Main, 11 Jan II)
(a) 2 and 0
(b) 0 and 2
(c) 4 and 0
(d) 2 and 1
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Solution:
- $Mn _2(CO) _{10}$ is an organometallic compound due to the presence of $Mn-C$ bond. The metal-carbon bond in organometallic compounds possess both $\sigma$ and $-\pi$ character. The $M-C \sigma$ bond is formed by the donation of lone pair of electrons from the carbonyl carbon into a vacant orbital of the metal. The $M-C \pi$-bond is formed by the donation of pair of electrons from a filled d-orbital of metal into vacant antibonding $\pi^{*}$ orbital of $CO$. The $M-L$ bonding creates a synergic effect which strengthens the bond between $CO$ and the metal.
The structure of $Mn _2(CO) _{10}$ is shown below :
