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Which of the following complex is homoleptic? [JEE Main 2024, 1 Feb (Shift 1)]

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Which of the following complex is homoleptic?

[JEE Main 2024, 1 Feb (Shift 1)]

a

\(\left[ Fe \left( NH _3\right)_4 Cl _2\right]^{+}\)

b

\(\left[ Ni \left( NH _3\right)_2 Cl _2\right]\)

c

\(\left[ Ni ( CN )_4\right]^{2-}\)

d

\(\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}\)

✓ Correct answer: c)

\(\left[ Ni ( CN )_4\right]^{2-}\)

Explanation

A homoleptic complex contains only one type of ligand.

(A) [Fe(NH₃)₄Cl₂]⁺ has NH₃ and Cl⁻ → heteroleptic

(B) [Ni(NH₃)₂Cl₂] has NH₃ and Cl⁻ → heteroleptic

(C) [Ni(CN)₄]²⁻ has only CN⁻ ligands → homoleptic

(D) [Co(NH₃)₄Cl₂]⁺ has NH₃ and Cl⁻ → heteroleptic

Thus, only option (C) satisfies the condition of having a single type of ligand. Hence, the correct answer is C.

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