Which of the following is/are correct regarding Crystal Field Theory (CFT) ?

In an isolated gaseous metal ion, five d orbitals are degenerate

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In an isolated gaseous metal ion, no d orbitals are degenerate

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If a spherically symmetrical field of ligands surrounds the metal atom/ion, degeneracy is lost

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If a spherically symmetrical field of ligands surrounds the metal atom/ion,this degeneracy is still maintained.

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Solution

The correct option is D If a spherically symmetrical field of ligands surrounds the metal atom/ion,this degeneracy is still maintained.
Assumptions of Crystal Field Theory (CFT) :
In an isolated gaseous metal ion, five d orbitals are degenerate. Orbitals that are identical in energy are called degenerate orbitals.
If a spherically symmetrical field of ligands surrounds the metal atom/ion,this degeneracy is still maintained.
When there is a negative field due to ligands in a complex (Either anions or the negative ends of dipolar molecules like $N H_{3}$ and $H_{2} O$ ) , it becomes asymmetrical and the degeneracy of the d-orbitals is lost. This results in splitting of d-orbitals.

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