GATE CY topic:chemical-reactions PYQs & Answers — Page 11

Questions 101–110 of 650. Imported answers require independent review unless marked reviewed.

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

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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)

Diagram for Chemistry question 38 (figure 4)

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

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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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The effective magnetic moment,

value for

taking into account for spin-orbit coupling is closest to

[Given: Atomic number of Cr = 24, spin-orbit coupling constant

, and

]

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3.79

3.87

4.05

3.60

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The major products X and Y formed in the following reaction sequences are

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X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 2)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 3)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 4)

X and Y structures shown in figure

Diagram for Chemistry question 41 (figure 5)

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Compound K displayed a strong band at 1680 cm

in its IR spectrum. Its

H-NMR spectral data are as follows:

(ppm) 7.30 (d, J = 7.2 Hz, 2H), 6.8 (d, J = 7.2 Hz, 2H), 3.8 (septet, J = 7.0 Hz, 1H), 2.2 (s, 3H), 1.9 (d, J = 7.0 Hz, 6H). The correct structure of compound K is

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Structure shown in figure