Coordination CompoundHard
Question
Which of the following statements is correct with respect to the metal carbonyls of Ist transition series?
Options
A.As M - Cπ bonding increases, the C - O bond length increases.
B.As positive charge on the central metal atom increases, the C - O bond length increases.
C.As electron density on the central metal atom increases, the C - O bond length increases.
D.(A) and (C) both.
Solution
Order of C - O bond strength :
[Mn(CO)6]+ > [Cr(CO)6] > [V(CO)6]- > [Ti(CO)6]2- and [Ni(CO)4] > [Co(CO)4]- > [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 π* 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 - Cπ bonding is enhanced and the C - O bond is diminished in strength.
[Mn(CO)6]+ > [Cr(CO)6] > [V(CO)6]- > [Ti(CO)6]2- and [Ni(CO)4] > [Co(CO)4]- > [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 π* 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 - Cπ bonding is enhanced and the C - O bond is diminished in strength.
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