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Coordination Complexes

In complexes ...

Question

In complexes of weak field ligands, $Δ_{o} < P$ (pairing energy), the energy difference between $t_{2 g}$ and $e_{g}$ sets is relatively less. Under the influence of strong field ligands, $Δ_{o} > P$ (pairing energy), the energy difference between $t_{2 g}$ and $e_{g}$ sets is relatively high.
The correct statement regarding $[C r (e n)_{2} C l_{2}]^{+}$ and $[C o (C_{2} O_{4})_{2} (N H_{3})_{2}]^{-}$ complex ions is :

both are equally stable complexes

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both have equal number of stereoisomers

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both are diamagnetic complexes

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none of the above

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Solution

The correct option is B both have equal number of stereoisomers
(A) The complexes $[C r (e n)_{2} C l_{2}]^{+} a n d [C o (C_{2} O_{4})_{2} (N H_{3})_{2}]^{-}$ contain different ligands and different metal ions. Hence, they have different stabilities. Thus, option A is incorrect.
(B) Both complexes are of the type $[M (A A)_{2}] a_{2}]^{n \pm}$ . Hence, they have equal number of sterioisomers. Hence, option B is correct.
(C) $[C r (e n)_{2} C l_{2}]^{+}$ is paramagnetic with 3 unpaired electrons and $[C o (C_{2} O_{4})_{2} (N H_{3})_{2}]^{-}$ is diamagnetic with zero unpaired electrons. Hence, option C is incorrect.

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Similar questions

Q. Which of the following statements is/are correct?
(i) In octahedral complexes,

t_{2 g}

orbitals possess low energy as compared to

e_{g}

orbitals.
(ii) In tetrahedral complexes,

t_{2 g}

orbitals possess high energy as compared to

e_{g}

orbitals.
(iii) In octahedral complexes,

e_{g}

orbitals possess low energy as compared to

t_{2 g}

orbitals.

Q. Assertion :Statement

-

1 : After splitting of d

-

orbitals during complex formation, the orbitals form two sets of orbitals

t_{2 g}

and

e_{g}

octahedral field. Reason: Statement

-

2 : Splitting of d

-

orbitals occurs only in the case of strong field ligands such as

C N^{-} .

Q. Assertion :According to crystal field theory, during complex formation, the d - orbitals split and form two sets of orbitals

t_{2 g}

and

e_{g}

Reason: Splitting of d - orbitals occurs only in case of strong field ligand

Q. Find the difference in the number of electrons in

t_{2 g}

and

e_{g}

set of orbitals of the complex

N a_{3} [C o F_{6}]

Q. Calculate the difference in the net stabilization energies (in

k J m o l^{- 1})

F e^{2 +}

octahedral complexes with

C N^{-}

ligands (

Δ_{0} = 25000 c m^{- 1})

and with

H_{2} O

ligands

(Δ_{0} = 10000 c m^{- 1})

. Given that the pairing energy,

E_{p} = 15000 c m^{- 1}

for

F e^{2 +}

ion in both the complexes. (Given: h =

6 \times 10^{- 34}

Jsec, Avogadro's Number =

6 \times 10^{23}

, Speed of light =

3 \times 10^{8} m s e c^{- 1}

)

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