1.

The IR stretchin frequencies of free CO, and CO [V(CO)_(6)]^(-),[Cr(CO)_(6)]^(-) and [Mn(CO)_(6)]^(-) are 2143cm^(-1),1860cm^-1),2000cm^(-1) and 2090cm^(-1), respectively. Then correct statemet about metal carbonyl is:

Answer»

C-O' bond is STRONGEST in the cation and WEAKEST in the anion.
C-O' bond is weakest in the cation and strongest in the anion
C-O' bond is longer in the cation than in the anion
M-C' pi bonding is HIGHER in the cation

Solution :In metal carbonyls:
Higher the negative oxidation state of CENTRAL metal: `prop `Bond LENGTH of C-O
`:prop(1)/("Bond order of CO")`
: Bond order of M-C bond.


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