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:

  1. $Mn _2(CO) _{10}$ 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 :



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