Q.

Among the ligands NH3 en, CN- and CO, the correct order of their increasing field strength, is

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a

CO<NH3< en <CN

b

NH3<en<CN<CO

c

CN<NH3<CO<en

d

 en <CN<NH3<CO

answer is B.

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Detailed Solution

Based on spectrochemical series, ligands arranged in increasing order of crystal field strength are as
NH3 < en < CN- < CO

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