GATE CY topic:organometalics PYQs & Answers

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topic:organometalics

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Questions 1–10 of 33. Imported answers require independent review unless marked reviewed.

Topic practice 33 questionsPage 1 of 4

The Vaska’s complex trans-IrCl(CO)(PPh₃)₂ shows a band at 1967 cm⁻¹ for the νCO stretching vibration in its infrared spectrum. The complex(es) that will show an increase in the νCO stretching vibration from 1967 cm⁻¹ is/are

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Diagram for Chemistry question 21 (figure 2)

Diagram for Chemistry question 21 (figure 3)

Diagram for Chemistry question 21 (figure 4)

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The reaction that proceeds through an oxidative addition followed by a reductive elimination is

[Given: Atomic numbers Ni = 28, Ta = 73, Zr = 40, Pt = 78]

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Diagram for Chemistry question 36 (figure 2)

Diagram for Chemistry question 36 (figure 3)

Diagram for Chemistry question 36 (figure 4)

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The homogeneous catalyst whose metal ion does NOT undergo either oxidation or reduction in any of the steps during the hydrogenation of terminal olefins is

Your answerChoose one option.

RhCl(PPh₃)₃

HRuCl(PPh₃)₃

[Ir(COD)(PCy₃)(Py)]⁺ PF₆⁻ (COD = cyclooctadiene)

[Rh(COD)(PPh₃)₂]⁺ PF₆⁻ (COD = cyclooctadiene)

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The given zirconocene compound, (η⁵-Cp)₂ZrEt₂, when heated in the presence of an equimolar amount of PMe₃ results in the formation of a compound X which obeys the 18 electron rule. The reaction also resulted in the release of a saturated hydrocarbon.

[Given: Atomic number of Zr = 40]

The structure of compound X is

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Diagram for Chemistry question 38 (figure 2)

Diagram for Chemistry question 38 (figure 3)

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Diagram for Chemistry question 38 (figure 5)

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The ¹H NMR spectrum of the given iridium complex at room temperature gave a single signal at 2.6 ppm, and its ³¹P NMR spectrum gave a single signal at 23.0 ppm. When the spectra were recorded at lower temperatures, both these signals split into a complex pattern. The intra-molecular dynamic processes shown by this molecule are

Your answerChoose one option.

Berry pseudo-rotation and rotation of the ethylene units along the C=C axis

Berry pseudo-rotation and proper type rotation of the ethylene units along the Ir-alkene axis

Ray-Dutt twist and rotation of the ethylene units along the C=C axis

Ray-Dutt twist and proper type rotation of the ethylene units along the Ir-alkene axis

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Among the following, the compound with the lowest CO stretching frequency is

Your answerChoose one option.

[Mn(CO)₆]⁺

[V(CO)₆]⁻

[Cr(CO)₅]

[Cr(dien)(CO)₃] (dien: diethylenetriamine)

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The number of metal-metal bond(s) in the complex

and in

. The value of

is ___. (Assume 18 electron rule is followed.) (Answer in integer)

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The hapticity of allyl and Cp and the ligation mode of NO in the thermodynamically stable complexes [(ηˣ-allyl)Ru(CO)₂(NO)] and [(ηʸ-Cp)Ru(CO)₂(NO)], respectively, are (The hapticity of allyl and Cp are denoted by ηˣ and ηʸ, respectively.)

Your answerChoose one option.

(η³, NO-bent) and (η⁵, NO-linear)

(η³, NO-linear) and (η⁵, NO-bent)

(η¹, NO-bent) and (η³, NO-bent)

(η¹, NO-bent) and (η⁵, NO-linear)

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In the following reactions, the structures of I, II, and III, respectively, are

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Diagram for Chemistry question 39 (figure 2)

Diagram for Chemistry question 39 (figure 3)

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Wacker oxidation of alkenes is catalyzed by a combination of

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Pd(II) and Cu(II)

Co(II) and Cu(II)

Pd(II) and Ni(II)

Pd(II) and Co(II)

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GATE CY topic:organometalics PYQs

How to practice topic:organometalics

Question 21

Question 36

Question 37

Question 38

Question 39

Question 11

Question 31

Question 38

Question 39

Question 21