1.

Which of the following molecule has lower v_(c-o) (stretching vibration frequency of C-O bond) ?

Answer»

`[Pt(CO)_(2)Cl_(2)]`
`[PtCl_(3)(CO)]^(Ө)`
Both have EQUAL `v_(c-o)`
None of these

Solution :As C-O bond STRENGTH`uarr`, stretching frequency `""^(V)couarr` (for C-O bond) CO is a better `pi`-ACCEPTOR than `Cl^(-)` hence, `[Pt Cl_(3)(CO)]^(-)` has better back bonding and poor C-O bond strength.


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