1.

Arrange the following complex in increadsing order of stretching vibrational frequency of C-O bond : (P) [(PPh_(3))_(3)Mo(CO)_(3)]""(Q) [(Ph_(2)PCl)_(3)Mo(CO)_(3)] (R )[(PhPCl_(2))_(3)Mo(CO)_(3)]""(S) [(PCl_(3))_(3)Mo(CO)_(3)]

Answer»

`PgtQgtRgtS`
`P=SgtRgtQ`
`S=PgtQgtR`
`PltQltRltS`

Solution :The `delta`-donating ability and `pi`-ACCEPTOR ability of phosphines are inversely CORRELATED in the sense that electron-rich phosphines, such as `PMe_(3)`, are GOOD `delta`-donors and poor `pi`-acceptors, whereas electron poor phosphines, such as `PF_(3)`, are poor `delta`-donors and good `pi`-acceptors. Thus, `pi`-ACCEPTING tendecy order :


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