The $I R$ stretchin frequencies of free $C O$ , and $C O$ in $[V (C O)_{6}]^{-}, [C r (C O)_{6}]^{-}$ and $[M n (C O)_{6}]^{-}$ are $2143 c m^{- 1}, 1860 c m^{- 1}, 2000 c m^{- 1}$ and $2090 c m^{- 1}$ , respectively. Then correct statement about metal carbonyls is?

^{'} C - O

bond is strongest in the cation an weakest in the anion

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^{'} C - O

bond is weakest in the cation an strongest in the anion

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^{'} C - O

bond is longer in the cation the anion

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^{'} M - C

pi bonding is higher in the cation

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Solution

The correct option is D $^{'} M - C$ pi bonding is higher in the cation
In metal carbonyls:
Higher the negative oxidation state of central metal : $\propto$ Bond length of $C - O$
$:\propto \frac{1}{Bond order of CO}$
: Bond order of $M - C$ bond.

Hence, Option "D" is the correct answer.

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Similar questions

[M n (C O)_{6}]^{+}, [T i (C O)_{6}], [C r (C O)_{6}]

[V (C O)_{6}]^{-}

C - O

v^{+}

v^{-}

N a_{2} C r O F_{4}

C r (H_{2} O)_{6} C l_{3}

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 A.)

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