Q36 · CSIR-NET Chemistry, June 2019
Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Reaction Mechanisms Substitution · Marks: 2 · Difficulty: Easy
The correct statement about base hydrolysis of $\left[\mathrm{Co}(\mathrm{py})_{4} \mathrm{Cl}_{2}\right]^{+}$(py-pyridine) is
(a)rate expression is, Rate- $\mathrm{k}\left[\mathrm{Co}(\mathrm{py})_{4} \mathrm{Cl}_{2}\right]^{+}\left[\mathrm{OH}^{-}\right]$
(b)reaction does not depend on hydroxide ion concentration
(c)reaction proceeds through $\mathrm{S}_{\mathrm{N} 1} \mathrm{CB}$ mechanism
(d)intermediate involved in this reaction is $\left[\mathrm{Co}(\mathrm{py})_{4} \mathrm{Cl}_{2}(\mathrm{OH})\right]$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
With no N–H on pyridine, no conjugate base forms; base hydrolysis of [Co(py)₄Cl₂]⁺ is independent of [OH⁻] (b).
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