Q94 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Hard
The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is 
(a)I $>$ II $>$ III
(b)$\mathrm{I} \approx \mathrm{III} \approx \mathrm{II}$
(c)I $>$ II $\approx$ III
(d)I $<$ II $\approx$ III
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
For d⁸ square-planar substitution, Ni(II) reacts fastest, then Pd(II); Pt(II) is about 10⁵ times slower than Pd(II). I > II > III (a).
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