Bridging and terminal CO ligands in polynuclear metal carbonyls

1. A.
   $\left\lbrack {Co}_{2}(CO)_{8} \right\rbrack$
2. B.
   $\left\lbrack {Mn}_{2}(CO)_{10} \right\rbrack$
3. C.
   $\left\lbrack {Os}_{3}(CO)_{12} \right\rbrack$
4. D.
   $\left\lbrack {Ru}_{3}(CO)_{12} \right\rbrack$

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1. A.
   Octahedral
2. B.
   Trigonal bipyramidal
3. C.
   Square pyramidal
4. D.
   Square planar

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