Question

Assertion : According to crystal field theory, during complex formation, the $d$-orbitals split and form two sets of orbitals $t_{2g}$ and $e_{g}$.
Reason : Splitting of $d$- orbitals occurs only in case of strong field ligands.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

Splitting of orbitals takes place for both weak and strong field ligands. Pairing of electrons in these orbitals depends on the strength of the field.