Question

Among the ligands NH₃, en, CN⁻ and CO the correct order
of their increasing field strength, is :
(a) NH₃ < en < CN⁻ < CO
(b) CN- < NH₃ < CO < en
(c) en < CN- < NH₃ < CO
(d) CO < NH₃ < en < CN⁻

Answer 1

●Among NH₃, en, CN⁻ and CO the correct order

of their increasing field strength, is (a) is correct,

● NH₃ < en < CN⁻ < CO.

According to the spectrochemical series.

●this series is used in coordinate compounds.

●strength depends upon the element's bonding.

● It is a strength list (spectrochemical series) and a list of metal ions based on oxidation number, group and its identity.

Answer 2

NH₃ < en < CN⁻ < CO is the correct order of strength of chelates

Explanation:

• The strength of chelate is depended on several factors like

• The oxidation state of the central atom.

• The surrounding radicles effecting the chelate.

• Among the chelates, the spectrometry studies reveal that there are different strengths of different chelates which are categorized in the chelate series.

• The oxidation state of the central atom often changes the strength.

• Carbon monoxide is the strongest of them which always acts as strong field chelate.

• Cyanide is also a strong field chelate.

• En is generally a strong field chelate.

• Ammonia can act as both strong field and weak field chelate.

For more information about field strength of chelates,

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Explain the position of chelate in spectrochemical series

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What is spectrochemical series? Explain the difference between a weak field chelate and a strong field chelate.