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Q.

In which of the following C - O bond energy is least

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a

[V(CO)6]

b

[Mn(CO)6]+

c

[Cr(CO)6]

d

[Ti(CO)6]–2

answer is D.

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Detailed Solution

[Ti(CO)6]–2 has most negative charge. Hence, Metal to ligand back donation is maximum in [Ti(CO)6]–2
This electron density is in the antibonding MO of CO.
This results in lowest bond order and maximum bond length for C-O bond in [Ti(CO)6]–2

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