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Chemistry Question on Bonding in Metal Carbonyls

Number of complexes which will exhibit synergic bonding amongst, [Cr(CO)6][Cr(CO)_6], [Mn(CO)5][Mn(CO)_5] and [Mn2(CO)10][Mn_2(CO)_{10}] is ________.

Answer

In the given complexes:

  1. [Cr(CO)6][Cr(CO)_6] - Chromium hexacarbonyl
  2. [Mn(CO)5][Mn(CO)_5] - Manganese pentacarbonyl
  3. [Mn2(CO)10][Mn_2(CO)_{10}] - Dimanganese decacarbonyl

Let's analyze each complex:

[Cr(CO)6]:[Cr(CO)_6]: Chromium is in the +2 oxidation state, and it has d6 electron configuration. It can exhibit synergic bonding due to back-bonding.
[Mn(CO)5]:[Mn(CO)_5]: Manganese is in the +1 oxidation state, and it has d7 electron configuration. It can exhibit synergic bonding due to back-bonding.
[Mn2(CO)10]:[Mn_2(CO)_{10}]: Manganese is in the +1 oxidation state here as well. The molecule contains a manganese-manganese bond, and each manganese can exhibit synergic bonding with the surrounding CO ligands.

All three complexes are likely to exhibit synergic bonding. CO ligand shows synergic bonding, so all complexes can show synergic bonding.

Therefore, the number of complexes that will exhibit synergic bonding is 3.