JEE Main · 2026 · 05 Apr 2026 · Shift 1 · Coordination Compounds

Given below are two statements :
Statement I : Each electron in

e_{g}

orbitals destabilizes the orbitals by

+ 0.6 Δ_{0}

and each electron in the

t_{2 g}

orbitals stabilizes the orbitals by

- 0.4 Δ_{0}

in an octahedral field on the basis of crystal field theory.
Statement II : All the d-orbitals of the transition metals have the same energy in their free atomic state but when a complex is formed the ligands destroy the degeneracy of these orbitals on the basis of crystal field theory.
In the light of the above statements, choose the correct answer from the options given below.

(A)Both Statement I and Statement II are correct✓ Correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but Statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Answer: (A)

Solution

In an octahedral field the five

d

orbitals split about the barycentre into a lower

t_{2 g}

set and an upper

e_{g}

set, each

t_{2 g}

electron contributing

- 0.4 Δ_{0}

of stabilisation and each

e_{g}

electron

+ 0.6 Δ_{0}

of destabilisation, so Statement I is correct. In the free ion all five

d

orbitals are degenerate, and it is the approach of the ligands that lifts this degeneracy through unequal electrostatic repulsion, so Statement II is correct. Both statements are correct.

Structure Crystal field splitting diagram — Crystal field splitting diagram

JEE Main · 2026 · 05 Apr 2026 · Shift 1 · Single correct option

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JEE Main · 2026 · 05 Apr 2026 · Shift 1 · Coordination Compounds

Solution

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