1.

Consider the following complexes. (P) [Cr(CO)_(5)(PF_(3))]""(Q) [Cr(CO)_(5)(PCl_(3))] Select the correct options.

Answer»

Both P and Q have longer CO BOND LENGTH than free CO molecule.
P has shorter CO bond length than Q.
P has longer Cr-C bond length than Q.
`PF_(3)` is a better `pi-acceptor` than `PCl_(3)`.

Solution :Due to back donation C-O bond length in given compounds is longer than free COmolecule. `PE_(3)` is better `pi`-acceptor than CO, hence back donation is more favoured towards `PF_(3)`rather than CO and `PF_(3)` is is better `pi`-acceptor than `PCl_(3)` hence `pi`-donation is more favourable in (P) than(Q). Hence,CO length in (P) is shorter than (Q). Due to LESS `pi`-donations towards CO or C bond is longer in (P) than (Q).


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