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Which of the following statement is correct with respect to the metal carbonyls of `I^(st)` transition series ?A. As M - `Cpi` bonding increases , the C-O bond becomes weakerB. As positive charge on the central metal atom increases , the C-O bond becomes weakerC. As electron density on the central metal atom increases, the C-O bond becomes weakerD. (A) and (C ) both |
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Answer» Correct Answer - D Order of C-O bond strength, `[Mn(CO)_6]^(+) gt [Cr(CO)_6]gt [V(CO)_6]^(-)gt [Ti(CO)_6]^(2-) gt and [Ni(CO)_4] gt [Co(CO)_4]^(-) gt [Fe(CO)_4]^(2-)`. (A)True statement. (B)As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into the `pi^(**)` orbitals of CO ligand to weaken the C-O bond. (C )In the carbonylate anions, the metal has a greater electron density to be dispersed, with the result that M-`Cpi` bonding is enhanced and the C-O bond is diminished in strength. |
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