1.

Correct sequence of CO bond order in given compounds is: (P) Fe(CO)_(5) (Q) CO (R) H_(3) B larr CO (S) [Mn(CO)_(5)]^(-)

Answer»

`P gt R gt S gt Q`
SgtPgtRgtQ
QgtSgtPgtR
RgtQgtPgtS

Solution :CO BOND order`prop(1)/("EXTENT of back bonding "(MTO CO))`
Correct sequence of CO bond order:
`underset(("CO bond order "gt3.0))(H_(3)B larr CO) gt underset(B.O.=3.0)(CO) gt underset(("CO bond order " LT 3.0))(Fe(CO)_(5)) gt underset(("CO bond order "lt 3.0))([Mg(CO)_(5)]^(-))`


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