Number of complexes which will exhibit synergic bonding amongst , and is

Question

Number of complexes which will exhibit synergic bonding amongst ,  and  is

Canvas Classes · Accepted Answer

Strategy:
 Recall that all classic metal carbonyls form through synergic bonding, where the  ligand acts strictly as both a -donor and a -acceptor.

Step 1: Evaluate each molecule
- : Chromium hexacarbonyl. Contains exclusively  ligands bonded via synergic bonding. (Yes).
- : Although sterically an unstable radical often dimerizing to , conceptually any metal-carbonyl bond operates via the synergic mechanism. (Yes).
- : Decacarbonyldimanganese(0). Typical metal carbonyl, utilizes synergic bondin

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