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Which of the following statements correctly explains why [Ni(trien)]²⁺ is more ...

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Which of the following statements correctly explains why [Ni(trien)]²⁺ is more stable than [Ni(en)]²⁺?

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 (ethylenediamine = en)                 

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(triethylenetetramine = trien)

a) [Ni(trien)]²⁺ is more stable because trien is tetradentate and binds weakly to Ni²⁺.

b) [Ni(en)]²⁺ is more stable because en is smaller and forms fewer chelate rings.

c) [Ni(trien)]²⁺ is more stable because trien is tetradentate and forms multiple chelate rings, increasing stability and entropy.

d) [Ni(en)]²⁺ is more stable because en is easily displaced by water molecules, while trien is not

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