1.

In the isoelectronic series of metal carbonyl, the CO bond strength is expected to increase in the order:

Answer»

`[MN(CO)_(6)]^(+) lt [Cr(CN)_(6)] lt [V(CO)_(6)]^(-)`
`[V(CO)_(6)]^(-) lt [Cr(CO)_(6)] lt [Mn(CO)_(6)]^(+)`
`[V(CO)_(6)]^(-) lt [Mn(CO)_(6)]^(+) lt [Cr(CO)_(6)]`
`[Cr(CO)_(6)] lt [Mn(CO)_(6)]^(+) lt [V(CO)_(6)]^(-)`

SOLUTION :CO bond strength is reciprocal to the extent of back DONATION involved in synergic bonding i.e., `M hArr CO`


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