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Among the ligands `NH_3, en, CN^– `and `CO`, the correct order of their increasing field strength, is
A. |
`CO < NH_3 < en < CN^–` |
B. |
`NH_3 < en < CN^– < CO` |
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C. |
`CN^– < NH_3 < CO < en` |
D. |
`en < CN^– < NH_3 < CO` |
Based on spectrochemical series, ligands arranged in increasing order of crystal field strength are as