Count the valence electrons in the following complexes: Cr(CO)6, Fe(C5H5)(CO)2I, Cr(C5H5)2 and Mn2(CO)10 [HINT - one of these compounds does not obey the rule] and rationalise their stability with reference to the 18 electron rule.
Fe(C5H5)(CO)2I
Mn2(CO)10
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