1.

Which of the following statement is correct with respect to the metal carbonyl of Ist transition series ?

Answer»

As `M-Cpi` bonding increases, the C-O bond length increases .
As positive charge on the central metal atom increases, the C-O bond length increases.
As ELECTRON DENSITY on the central metal atom increases, the C-O bond length increases.
(a) and (c ) both

SOLUTION :As M-C bond BECOMES stronger, C-O B.L.`uarr`. M-C bond becomes stronger when BACK bonding from metal to C occurs, which is possible when electron density on metal is high


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