Jahn-Teller distortion of $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$ acts to
(a)Raise symmetry
(b)Remove and electronic degeneracy
(c)Cause loss of $\mathrm{H}_{2} \mathrm{O}$ ligand
(d)Promote a d-electron to an antibonding molecular orbital.
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Cu²⁺ (d⁹) in an octahedral field has a degenerate E_g ground state; the Jahn–Teller distortion (tetragonal elongation) lowers the symmetry to remove that electronic degeneracy.