Consider the reactions 1. [Cr (H₂O)₆]²⁺+ [CoCl (NH₃)₅]²⁺ → [Co (NH₃)₅ (H₂O)]²⁺+ [CrCl (H₂O)₅]²⁺ 2… · ABC26IN0343

Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy

Consider the reactions
\[ \begin{array}{l} 1.\ \left[\mathrm{Cr}\left(\mathrm{H}_{2}\mathrm{O}\right)_{6}\right]^{2+}+\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+} \rightarrow \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\left(\mathrm{H}_{2}\mathrm{O}\right)\right]^{2+}+\left[\mathrm{CrCl}\left(\mathrm{H}_{2}\mathrm{O}\right)_{5}\right]^{2+} \\ 2.\ \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}+\left[\mathrm{Mo}(\mathrm{CN})_{8}\right]^{3-} \rightarrow \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-+}+\left[\mathrm{Mo}(\mathrm{CN})_{8}\right]^{4-} \end{array} \]
(i) Both involve an inner sphere mechanism. (ii) Both involve an outer sphere mechanism (iii) Reaction 1 follows inner sphere and reaction 2 follows outer sphere mechanism (iv) Reaction 1 follows outer sphere and reaction 2 follows inner sphere mechanism.
(a)i
(b)ii
(c)iv
(d)iii
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Reaction 1 is Taube's classic inner-sphere case: Cl bridges and ends up on Cr. Reaction 2 occurs between two substitution-inert cyanide complexes, so it is outer sphere. Statement iii (d).

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