The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is I II III · ABC26IN0285
Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Exam: CSIR NET 2020 · Marks: 2 · Difficulty: Hard
The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is 
I 
II 
III
I II III(a)I $>$ II $>$ III
(b)I $\approx$ III $\approx$ II
(c)I $>$ II $\approx$ III
(d)I $<$ II $\approx$ III
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
For square-planar d⁸ complexes substitution rates fall down the triad, Ni ≫ Pd ≫ Pt (roughly 5×10⁶ : 10⁵ : 1): I > II > III (a).
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