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The realtive stabilities of metal carbon...

The realtive stabilities of metal carbonyls and their ions can be explained on the basis of a rule which is known as `18e^(-)` rule. If number of valence shell electrons of the metal + number of electrons donated by bonded CO groups comes to be 18 electrons, then carbonyl is said to be stable.
Some heteroleptic/noncarbonyl complexes also follow 18 electron rule. Identify the number of complexes following the rule.
`[Mn(CO)_(5)], [Co(CO)_(4)] [(eta^(5)-C_(5)H_(5))_(2)Fe]`,
`[(CO)_(5)(PF_(3))]^(+), [(eta^(5)-C_(5)H_(5)) [Cr(NO)_(4)], Fe(CO)_(2)Cl]`,
`[Fe(CO)_(2)(NO)_(2)], [Fe(CO)_(5)], [Mn_(2)(CO)_(10)]`

A

7

B

8

C

9

D

6

Text Solution

Verified by Experts

The correct Answer is:
A
Except `[Mn(CO)_(5)]` and `[Co(CO)_(4)]`, all others follow.
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