Q32 · CSIR-NET Chemistry, June 2019

Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Medium

Hydrolysis of trans-$\mathrm{[CoLCl(en)_2]^{+}}$ (L $= \mathrm{NO_2^{-}}$, $\mathrm{NCS^{-}}$, $\mathrm{OH^{-}}$, $\mathrm{Cl^{-}}$) results in a product (A). The tendency to form cis-isomer of the product (A) follows the order
(a)L $= \mathrm{NO_2^{-}} < \mathrm{NCS^{-}} < \mathrm{OH^{-}} < \mathrm{Cl^{-}}$
(b)L $= \mathrm{NO_2^{-}} < \mathrm{Cl^{-}} < \mathrm{NCS^{-}} < \mathrm{OH^{-}}$
(d)L $= \mathrm{OH^{-}} < \mathrm{NCS^{-}} < \mathrm{Cl^{-}} < \mathrm{NO_2^{-}}$
(c)L $= \mathrm{OH^{-}} < \mathrm{Cl^{-}} < \mathrm{NO_2^{-}} < \mathrm{NCS^{-}}$
Answer
Answer: B ✓ checked by 4AB · confidence high

The source book printed C; on checking, B is correct — see the explanation.

Book printed (c).

Explanation
Percentage cis product: NO₂⁻ (0) < Cl⁻ (35) < NCS⁻ (~60) < OH⁻ (75) (b).

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