Do all five orbitals of the d-sub shell have equal energies?

[mishrashubham]

See Title

 

[mishrashubham]

*bump*

 

[daveyrocket]

In a spherical environment and neglecting interactions, yes. Actually, even neglecting interactions if you include relativistic corrections (spin-orbit coupling) the 10 d orbitals will split into groups of j = 3/2 and j = 5/2, with different energies, although maybe only slightly different.

Once you include interactions, even in a spherical environment, no. Hund's rules give a specific order for filling the orbitals, and this is because other fillings will be higher in energy.

 

[Saitama]

The simplest answer is Yes.
All the orbitals of any d-subshell are degenerate.