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Which of the following has the shortest ...

Which of the following has the shortest Cr-C bond length ?

A

`[Cr(CO)_(6)]`

B

`[Cr(NH_(3))_(3)(CO)_(3)]`

C

`[Cr(PF_(3))_(3)(CO)_(3)]`

D

`[Cr(PPh_(3))_(3)(CO)_(3)]`\

Text Solution

Verified by Experts

The correct Answer is:
B
`[Cr(NH_(3))_(3)(CO)_(3)]` due to the presence of classical ligand `NH_(3)` electron density at the central metal atom increases.
`NH_(3)` `rarr` Classical ligand
Synergic bonding with CO increases, Cr-O bond length increases.
Cr-C bond length decreases Maximum back bonding to `pi^(*)` CO occurs in `[Cr(NH_(3))_(3) (CO)_(3) ]` , thus, M -C bond order`uarr`, B.L.`darr`
Note : `NH_(3)` doesn’t show back bonding.
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