JEE Main 2025 — Coordination Compounds Question with Solution
From: JEE Main 2025 (Online) 2nd April Morning Shift
Question
Given below are two statements :
Statement (I) : In octahedral complexes, when high spin complexes are formed. When low spin complexes are formed.
Statement (II) : In tetrahedral complexes because of , low spin complexes are rarely formed.
In the light of the above statements, choose the most appropriate answer from the options given below :
Choose an option
Show full solutionCorrect option: D
Step-by-step explanation
In octahedral complexes, which have a coordination number (CN) of 6, the formation of high spin or low spin complexes depends on the relative magnitude of the crystal field splitting energy, denoted as Δ₀, and the pairing energy (P.E.):
If Δ₀ is less than the pairing energy (Δ₀ < P.E.), high spin complexes are formed.
If Δ₀ is greater than the pairing energy (Δ₀ > P.E.), low spin complexes are formed.
In tetrahedral complexes, where the coordination number is 4:
The crystal field splitting energy (Δₜ) is typically less than the pairing energy (Δₜ < P.E.), resulting in the formation of mainly high spin complexes. Low spin complexes are rarely observed in tetrahedral coordination due to this energy consideration.
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