Reaction Mechanisms in Coordination Compounds MCQs for CSIR NET & GATE - Download PDF

Vijay Ishwar
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Reaction Mechanisms in
Coordination Complexes

Coordination Compounds
Topic wise assignment-8

QUIZ        PDF

Q1. In the following redox reaction with an equilibrium constant K = 2.0 x 108,
The self-exchange rates for oxidant and reductant are 5.0 M-1 s-1 and 4.0 x 103 M-1 s-1, respectively. The approximate rate constant (M-1 s-1) for the reaction is

[NET Dec 2016]

          (a) 3.16 x 106

          (b) 2.0 x 106

          (c) 6.32 x 106

          (d) 3.16 x 104

Q2. For OH- catalyzed SN1 conjugate base mechanism of [Co(NH3)5Cl]2+, the species obtained in the first step of the reaction is/are

[NET Dec 2016]

          (a) [Co (NH3)5 OH]2+ + Cl-

          (b) [Co (NH3)4 (NH2) Cl]+ + H2O

          (c) [Co (NH3)4 (NH2) Cl]2+ + Cl-

          (d) [Co (NH3)5 Cl (OH)]+ only

Q3. In the hydrolysis of trans- [Co(en)2Cl(A)]+, if the leaving group is chloride, the formation of cis product is the least, when A is

          (a) NO2-

          (b) NCS-

          (c) Cl-

          (d) OH-

Q4. Predict the products of the following reactions:

[TIFR 2016]

[Pt(PPh3)4]2+ + 2Cl- X

[PtCl4]2- + 2 PPh3 Y

          (a) X = trans- [PtCl2 (PPh3)2] and Y = cis- [PtCl2 (PPh3)2]

          (b) X = cis- [PtCl2 (PPh3)2] and Y = trans- [PtCl2 (PPh3)2]

          (c) X = Y = cis- [PtCl2 (PPh3)2]

          (d) X = Y = trans- [PtCl2 (PPh3)2]

Q5. Aqueous Cr2+ effects on electron reduction of [Co(NH3)5Cl]2+ giving compound Y. Compound Y undergoes rapid hydrolysis. Y is

[NET Dec 2015]

          (a) [Co(NH3)5]2+

          (b) [Co(NH3)5(OH)]+

          (c) [Co(NH3)4(OH)2]

          (d) [Co(H2O)5Cl]2+

Q6. The correct statement about the substitution reaction of [Co(CN)5Cl]3- with OH- to give [Co(CN)5OH]3- is

[NET Dec 2015]

          (a) it obeys first order kinetics

          (b) its rate is proportional to the concentration of both the reactants

          (c) it follows the SN1CB mechanism

          (d) its rate is dependent only on the concentration of [OH]-

Q7. The mechanism of the reaction between [Fe(CN)6]4- and [Fe(bpy)3]3+ (bpy = 2, 2’-bipyridine) is:

[GATE 2010]

          (a) outer sphere electron transfer

          (b) inner sphere electron transfer

          (c) self-exchange reaction

          (d) ligand exchange followed by electron transfer

Q8. The one CO group is replaced by PPh3 in [Cr(CO)6], which one of the following statements is TRUE?

[GATE 2015]

          (a) The Cr-C bond length increases and CO bond length decreases

          (b) The Cr-C bond length decreases and CO bond length decreases

          (c) The Cr-C bond length decreases and CO bond length increases

          (d) The Cr-C bond length increases and CO bond length increases

Q9. The potential energy PE versus reaction coordinate diagrams for electron transfer reactions with rate constants k1, k2 and k3 are given below. The increasing order of rate constants is

[GATE 2015]

          (a) k2 < k3 < k1

          (b) k2 < k1 < k3

          (c) k3 < k2 < k1

          (d) k3 < k1 < k2

Q10. Identify X in the reaction [Pt(NH3)4]2+ + 2 HCl X

          (a) cis- [PtCl2(NH3)2]

          (b) trans- [PtCl2(NH3)2]

          (c) [PtCl(NH3)3]+

          (d) [PtCl3(NH3)]-

Ans Key

1.b 2.b 3.a 4.b 5.a 6.a 7.c 8.c 9.d 10.b 

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