In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

Question

Canvas Classes · Accepted Answer

Strategy:
 Recognize the common structural motifs in simple homoleptic dinuclear metal carbonyls.

Step 1: Evaluate structural presence of bridging carbonyls
- : The two  halves are linked only by a single  bond. All 10  groups are terminal.
-  and : These form a triangle of metal atoms holding only terminal  ligands.
- : In its standard solid-state form, it features a  bond supported by two bridging  ligands, with the remaining six  ligands being terminal.

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