The correct trend in the rate of substitution of Cl⁻ by pyridine in the following complexes is (I) (II) (III)… · ABC26IN0652
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Compounds – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
The correct trend in the rate of substitution of $\mathrm{Cl^{-}}$ by pyridine in the following complexes is (I) 
(II) 
(III) 
(IV) 
(II) (III) (IV) (a)III $<$ II $<$ I $<$ IV
(b)II $<$ III $<$ I $<$ IV
(c)I $<$ II $<$ III $<$ IV
(d)III $<$ II $<$ IV $<$ I
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
The trans-labilising strength of the ligand opposite Cl⁻ sets the rate: Cl (III) < C₆H₅ (II) < CH₃ (I) < H (IV), the hydride having the strongest trans effect — (a).
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