NEET | 2016Chemical BondingHard

Question

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

Options

A.

Ni(CO)4

B.

[Co(CO)4]⊕

C.

[Fe(CO)4]2-

D.

[Mn(CO)6]+

Solution

Metal carbon bond in metal carbonyls possess both σ and π character. M - C π bond is formed by donation of a pair of electrons from filled orbital of metal into vacant antibonding π orbital of CO. CO bond length increases if M has more tendency to donate lone pair by metal more CO bond length.

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