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Select the correct order of M - C bond o...


Select the correct order of `M - C` bond order in the following molecule and ions :
I. `[Ni(CO)_4]` II. `[Co(CO)_4]^(Theta)` III. `[Fe(CO)_4]^(2-)`

A

`I gt II gt III`

B

`I = II = III`

C

`II gt III gt I`

D

`I lt II lt III`

Text Solution

Verified by Experts

The correct Answer is:
D

Higher the negative oxidation state of central metal , the higher will be back donation from `M overset(x) to C-=O`, hence M - C bond order will increase.
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Knowledge Check

  • Select the correct order of C - O bond length in the following molecules I. [Mo(CO)_3 (PF_3)_3] II. [Mo(CO)_3 (PCl_3)_3] III. [Mo(CO)_3(P (Me)_3)_3]

    A
    `I gt II gt III`
    B
    `III gt I gt II`
    C
    `II gt III gt I`
    D
    `I lt II lt III`

  • Choose the correct order for Delta_0 for the following complexes. I. [Co(H_2O)_6]^(2+) II. [Co(H_2O)_6]^(3+) III. [Fe(H_2O)_6]^(3+) IV. [Fe(CN)_6]^(3-)

    A
    `I lt Iilt III lt IV `
    B
    `I lt III lt II lt IV `
    C
    `I lt II = III lt IV`
    D
    `I lt II lt IV lt III`

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    A
    `I lt II lt III lt IV `
    B
    `I lt III lt II lt IV `
    C
    `I lt II = III lt IV`
    D
    `I lt II lt IV lt III`