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Question

According to the spectrochemical series, which is the strongest field ligand:

A
CN
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B
NO2
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C
NH3
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D
ethane 1,2diamine (en)
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Solution

The correct option is A CN
Increasing order of strength of ligands
I<Br<S2<SCN<Cl<N3<Et2O<F<OH<EtOH<OX2<H2O<NCS<EDTA<PyNH3<en<BiPyOphen<

NO2<CN<CO<N+O
Hence, strongest legand is CN
Therefore, the correct option is (a).

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