JEE MAIN - Chemistry (2022 - 27th July Evening Shift - No. 7)
Low oxidation state of metals in their complexes are common when ligands :
have good $$\pi$$-accepting character
have good $$\sigma$$-donor character
are having good $$\pi$$-donating ability
are having poor $$\sigma$$-donating ability
Explanation
Ligands like : CO, are sigma donor and $\pi$-acceptor and they make stronger bond with lower oxidation state metal ion, in this case back bonding is more effective
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