1.

The complexes having different CO bond length is/are :

Answer»

`Mn_(2)(CO)_(10)`
`Co_(2)(CO)_(8)`
`Fe_(2)(CO)_(9)`
`Fe(CO)_(5)`

SOLUTION :(a) `Mn^(2)(CO)_(10)` has no bridge bond, HENCE all C-O bond length are EQUAL.
(b)


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