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Standard XII

Chemistry

Introduction to CFT

Assertion :Ac...

Question

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

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Splitting of orbitals takes place for both weak and strong field ligands. It happens because of electron repulsion due to the approach of ligands to metal. If the orbital lies along the axis of the approach of the ligand, it requires more energy to put an electron in the orbital.
However, the pairing of electrons in these orbitals depends on the strength of the field.

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Similar questions

Q. Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals

t_{2 g}

and

e_{g}

octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as

C N^{-}

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Statement-1 : In (cyclobutadiene) all C-C bond lengths are equal.

Statement-2 : Cyclobutadiene is aromatic and the

Π

orbitals are orthogonal to each other.

The Assertion and Reason are given, you are required to choose any one of the following four responses.

A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C) The Assertion is correct but Reason is incorrect

D) Both Assertion and Reason are incorrect

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

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Assertion :According to crystal field theory, during complex formation, the d - orbitals split and form two sets of orbitals t2g and eg Reason: Splitting of d - orbitals occurs only in case of strong field ligand

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