Coordination Compounds: EAN rule MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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EAN ruleMediumQuestion 740008

Question

Which of the following is the strongest ligand according to the spectrochemical series?

A
CN⁻
Correct
B
Cl⁻
C
H₂O
D
NH₃

Correct answer

CN⁻

Explanation

Spectrochemical series (weak to strong field): I⁻ < Br⁻ < Cl⁻ < F⁻ < OH⁻ < ox²⁻ < H₂O < en < NH₃ < NO₂⁻ < CN⁻ < CO. CN⁻ is the strongest field ligand among common ones.

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