The theory that can completely/properly explain the nature of bonding in $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ is

JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Coordination Compounds

The theory that can completely/properly explain the nature of bonding in

[Ni (CO)_{4}]

(A)Werner's theory
(B)Crystal field theory
(C)Molecular orbital theory✓ Correct
(D)Valence bond theory

Answer: (C)

Solution

Bonding in

[Ni (CO)_{4}]

is synergic: carbon monoxide donates a lone pair into nickel while filled metal

d

orbitals back-donate into the empty

π^{*}

orbitals of CO. Only molecular orbital theory describes both the

σ

-donation and this

π

back-bonding, whereas valence bond and crystal field pictures capture geometry or

d

-splitting but not the full bonding, so molecular orbital theory explains it completely.

JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Single correct option

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