1.

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

Answer»

`[Cr(CO)_(6)]`
`[Cr(NH_(3))_(3)(CO)_(3)]`
`[Cr(PF_(3))_(3)(CO)_(3)]`
`[Cr(PPh_(3))_(3)(CO)_(3)]`\

Solution :`[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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